How to Unlock the 4th Gear Slot in Jujutsu Zero

The fourth gear slot is the Emblem Slot sold through the Investigation Shop. Reaching that purchase starts with Investigations, but completing an Investigation is only the activity checkpoint. At the end, you must actively claim the reward chest. The resulting Edo Crate is not deposited automatically merely because the Investigation was completed, so leaving before the claim can break the expected progression loop.

After claiming the reward, return to the main world and open Supplies. Supplies is where you verify the Cursed Crystals you own. Once the visible balance is confirmed, inspect the Investigation Shop and select the Emblem Slot unlock. Do not rely on a remembered price or a value from an older clip; read the amount and availability shown by the shop in your current server before confirming anything.

Once unlocked, the fourth slot accepts one Emblem. Treat the unlock and the item as two separate states: purchasing the Emblem Slot creates the equipment position, while obtaining and equipping an Emblem fills it. Edo Crates can help with the second state because they can contain Emblems, and they can also contain most materials used with the Ailment system.

Official media

Activity

Investigations

Manual claim

Edo Crate reward chest

Currency check

Supplies in the main world

Unlock location

Investigation Shop

Shop option

Emblem Slot

Fourth-slot item

One Emblem

Use the following order for a clean, auditable unlock. It separates the activity result, the manually claimed crate, the crystal balance, the shop purchase, and the equipped Emblem so that a problem can be traced to one exact checkpoint. If the current interface differs from the wording below, follow the live labels and stop before spending until you can identify the equivalent Emblem Slot option.

1. 01
   Start an Investigation

   Enter an Investigation that your current character can complete reliably. This guide does not assign a required difficulty or promise that one tier is universally best.

2. 02
   Finish the Investigation

   Complete the activity and remain through its ending state. Do not treat the clear itself as proof that the Edo Crate has already entered your inventory.

3. 03
   Claim the reward chest

   Actively interact with the end reward chest and confirm the Edo Crate claim before leaving the Investigation. This manual claim is a required part of the route.

4. 04
   Return to the main world

   Once the claim is complete, return to the main world so you can inspect the relevant inventory and shop interfaces in a stable state.

5. 05
   Open Supplies

   Use Supplies to read your current Cursed Crystal balance. Check the visible value rather than assuming every claimed crate changed it by a fixed amount.

6. 06
   Open the Investigation Shop

   Find the shop option named Emblem Slot and read its current requirement. The live shop, not an undated guide number, decides whether the unlock is available.

7. 07
   Unlock the Emblem Slot

   Use Cursed Crystals to confirm the Emblem Slot purchase only after the shop clearly shows the correct option and your available balance.

8. 08
   Equip one Emblem

   Open the equipment interface, locate the newly available fourth position, and place one owned Emblem in it. Verify that the slot remains filled after closing and reopening the interface.

Plan every Investigation run around the reward claim, not only around the completion screen. A successful clear gets you to the claim point, but the Edo Crate does not move into inventory automatically. When the activity ends, stay in the Investigation, locate the reward chest made available by the completion, interact with it, and wait for the claim state to finish before changing worlds or starting another run.

This distinction matters because the clear and the claim answer different questions. The clear proves that the activity ended successfully; the chest interaction proves that you collected the Edo Crate tied to that result. If you return to the main world immediately after the clear, you may remember completing the Investigation but have no crate to inspect. That can look like a missing reward when the actual missing step was the manual claim.

Build a simple habit: clear, pause, find chest, claim, verify, leave. Do not insert a server change or menu exit between those checkpoints. If the reward interaction does not visibly complete, remain in place and inspect the current activity state instead of assuming the crate will be delivered later. The goal is not to predict a reward; it is to establish that the manually claimed container reached your account.

• Stay through the completed Investigation state.
• Treat the reward chest as a separate interaction.
• Confirm the Edo Crate claim before returning to the main world.
• Do not assume a clear automatically deposits the crate.
• Repeat only after one complete clear-and-claim cycle is verified.

In the main world, open Supplies and use the displayed Cursed Crystal balance as the currency checkpoint for this route. Do not substitute an Edo Crate count, an Emblem count, or an Ailment-material count for Cursed Crystals. These resources participate in related gear progression, but the Investigation Shop uses the visible Cursed Crystal balance for the Emblem Slot unlock.

For a careful first run, note the balance before an Investigation session and read it again after completing and claiming your reward flow. This is a personal verification method, not a promised per-run payout. The available evidence does not support a fixed reward amount or drop probability, and this page deliberately avoids turning a small sample into a permanent rule.

If the balance is lower than the shop currently requires, continue only with the verified loop: complete another Investigation, manually claim its Edo Crate, return to the main world, and recheck Supplies. Do not assume a higher difficulty guarantees the missing amount, and do not select a difficulty solely because an old recording presents it as optimal. Reliable completion and correct reward collection are the controllable parts of this guide.

Open the Investigation Shop and locate the option explicitly labeled Emblem Slot. That shop option is the fourth gear-slot unlock covered by this guide. Read the name twice before confirming, especially if the shop presents other Investigation-related choices. A purchase elsewhere or an item with an Emblem-like name is not proof that the equipment position was unlocked.

Compare the requirement displayed by the current shop with the Cursed Crystal balance you just verified in Supplies. The exact price is intentionally not reproduced here because it is not part of the verified fact set for this page and could change. The safe rule is simple: use the live shop requirement, make sure the selected option says Emblem Slot, and confirm the purchase only when the current interface shows enough Cursed Crystals.

After purchase, reopen the equipment interface and look for the new position rather than assuming the transaction finished. The visible fourth slot is the success state. If the shop no longer offers the option but the fourth position is not visible, close and reopen the relevant interface once and confirm you selected Emblem Slot. Preserve your observations before attempting another spend or changing servers.

Official media

Currency

Cursed Crystals

Shop

Investigation Shop

Purchase name

Emblem Slot

Success state

Fourth equipment position visible

Capacity

One additional Emblem

Current price

Read the live shop

Unlocking the slot does not create a free universal gear bonus by itself. The fourth position holds one Emblem, so open the equipment interface and choose an Emblem you already own. Place it in the newly available position, close the interface, and reopen it to confirm the equipped state persisted. This separates a successful shop unlock from a successful equipment change.

Edo Crates can provide Emblems, which is why claiming the reward chest remains useful beyond the Cursed Crystal route. However, this page does not claim that every crate contains an Emblem, that any named Emblem has a particular chance, or that one Emblem is best. Inspect the items you actually own and use their current in-game descriptions when choosing what to place in the fourth slot.

A fourth slot expands the number of Emblems you can equip by one; it does not remove the need to understand each equipped item's current state. When comparing options, change only the fourth Emblem and keep the other slots stable. That makes any visible difference easier to attribute without inventing a numerical effect or universal ranking that the verified evidence does not provide.

• Confirm the fourth position exists after the shop purchase.
• Select one Emblem that is visibly owned.
• Equip it in the new position and reopen the interface.
• Keep the other Emblem slots unchanged while comparing options.
• Use live descriptions instead of an undated best-in-slot list.

Edo Crates can provide Emblems and most Ailment materials. That makes the manually claimed crate relevant to both filling the newly unlocked slot and working with an Emblem later. It does not mean every crate awards both categories, and it does not establish a guaranteed reward or a drop rate. Open and evaluate only what your account actually receives.

An Ailment applies to an Emblem. It should therefore be treated as a modification associated with an Emblem, not as a separate fourth-slot item. First confirm the Emblem you want to use, then inspect the current Ailment interface and the materials it displays. Do not assume that owning an Ailment material means an Ailment has already been attached or that the material itself can occupy the fourth gear slot.

Keep the progression order clear: unlock the Emblem Slot with Cursed Crystals, equip one Emblem in that fourth position, and handle any Ailment work through the Emblem-related interface shown by the current game. This order prevents three common mix-ups: treating a crate as currency, treating an Ailment material as gear, or believing the slot purchase automatically supplies an Emblem.

1. 01
   Claim Edo Crates correctly

   Finish Investigations and manually claim the end reward chest before leaving the activity.

2. 02
   Inspect actual contents

   Use the current inventory to identify any Emblem or Ailment material received; do not assume a fixed crate result.

3. 03
   Equip the Emblem

   Place one owned Emblem in the unlocked fourth position and verify that it remains equipped.

4. 04
   Apply Ailment work to an Emblem

   Use the live Ailment flow with the intended Emblem and the materials shown by the current interface.

Jujutsu: Zero can change interface details while leaving the broad route recognizable. A patch-safe guide therefore verifies named states instead of memorizing a coordinate or a number. Before a farming session, make sure the activity is still called an Investigation. At its end, confirm the reward chest still requires an active claim and that an Edo Crate is associated with that claim. Back in the main world, confirm that Supplies still displays Cursed Crystals and that the Investigation Shop still offers Emblem Slot.

After the purchase, verify the equipment result directly. The fourth position should be visible and should accept one Emblem. If an Ailment is part of your plan, confirm that the current flow applies it to an Emblem. These checks do not require an assumed price, reward quantity, level, difficulty, or best item, so they remain useful even when a balance update changes a volatile value.

Stop if any named checkpoint disappears or changes meaning. Capture the new shop label, reward behavior, or equipment screen before proceeding. A live interface difference is evidence that the route needs review, not a reason to force the old sequence through a similarly named button. Spending later is safer than spending on an option that has not been matched to the fourth Emblem Slot.

• Investigation completion is visible.
• The end reward chest is actively claimed.
• The Edo Crate claim is confirmed before leaving.
• Cursed Crystals are checked under Supplies in the main world.
• Emblem Slot is selected in the Investigation Shop.
• The fourth position accepts one Emblem.
• Any Ailment operation is attached to an Emblem.

The most common mistake is leaving immediately after completing an Investigation. Completion and collection are not the same event: Edo Crates do not automatically enter inventory, so the reward chest must be claimed. Make the chest interaction part of every run rather than a step you remember only when the expected crate is missing.

A second mistake is checking the wrong resource. Return to the main world and use Supplies for the Cursed Crystal balance. The claimed Edo Crate, any Emblem inside a crate, and any Ailment material are related to the same wider progression loop, but none of them should be read as the Cursed Crystal balance used by the Investigation Shop.

A third mistake is buying or opening something with a similar theme and assuming the fourth slot is unlocked. The target shop option is Emblem Slot in the Investigation Shop, and the success state is a fourth equipment position that accepts one Emblem. Verify both the label before purchase and the slot after purchase.

A fourth mistake is treating an Ailment as another equipment item. An Ailment applies to an Emblem. Equip the Emblem in the fourth slot, then use the current Emblem-related Ailment flow. Finally, avoid copying an exact cost, guaranteed crate result, or best Emblem from an undated answer. Those claims are outside the verified evidence for this route.

No Edo Crate

Check the manual chest claim

Wrong balance

Open Supplies

Slot still closed

Verify Emblem Slot purchase

Nothing equipped

Add one owned Emblem

Ailment confusion

Apply it to an Emblem

Outdated number

Use the live interface

What is the fourth gear slot called? The unlock is called Emblem Slot in the Investigation Shop. After it is unlocked, the fourth equipment position holds one Emblem.

How do I get the currency for the unlock? Complete Investigations, actively claim the reward chest at the end, return to the main world, and check your Cursed Crystals in Supplies. Use the visible balance against the current Emblem Slot requirement in the Investigation Shop.

Do Edo Crates enter inventory automatically after an Investigation? No. You must actively claim the end reward chest. Do not leave the activity just because the Investigation completion state appeared.

Does unlocking Emblem Slot automatically give me an Emblem? The verified unlock creates the fourth position; filling it requires one Emblem you own. Edo Crates can provide Emblems, but this guide does not promise that every crate contains one.

Where do I check Cursed Crystals? Return to the main world and open Supplies. Use the balance shown there when deciding whether the current Investigation Shop requirement can be met.

Can an Ailment occupy the fourth slot? The fourth slot holds an Emblem. An Ailment applies to an Emblem, so it is not treated as a separate fourth-slot equipment item.

Can Edo Crates help with Ailments? Edo Crates can provide most Ailment materials. Inspect the actual crate contents and the current Ailment interface instead of assuming a particular material is guaranteed.

How much does the fourth slot cost? Check the Emblem Slot listing in the live Investigation Shop. This guide intentionally does not repeat an unverified or potentially outdated price.

Which Investigation difficulty should I run? Use one you can complete and claim reliably. The verified route does not establish a universal difficulty requirement or a guaranteed reward advantage for a specific tier.

What is the best Emblem for the new slot? This page does not publish a best Emblem because the available fact set does not support a current universal ranking. Compare Emblems you actually own using their live descriptions and the activity you intend to play.