Equipment Improvement (Akashi's Arsenal)

Equipment improvement happens in Akashi's Arsenal (改修工廠, Kaishū Kōshō). With Akashi as your 1st-fleet flagship you spend improvement materials (改修資材, “screws”), development materials and resources to add stars (★) to a piece of gear. The stat screen doesn't change, but the bonus is applied in battle.

From the wiki's data, the low stars are the cheap, safe part: ★0 to ★4 never fails, while costs rise and success rates drop after that. For a newer player, spreading a few stars across commonly used guns and torpedoes looks like better value than pushing one item to ★max.

1. 1Get the repair ship Akashi (明石). See How to Get Akashi.
2. 2Clear the early quest Prepare the Improvement Arsenal (改修工廠を準備せよ！) — it gives 5 screws. It appears after the seaplane tender deployment quest.
3. 3Put Akashi (or Akashi Kai) as the flagship of the 1st fleet.
4. 4Enter from the home port: the Arsenal button appears next to the Factory (工廠) button. You can also click the crane at the bottom left of second-level screens such as Organize.

• The list of improvable gear depends on the day of the week (it changes at 0:00 JST) and on your 2nd ship. With a matching 2nd ship, some menu items are replaced with special improvements.
• Gear equipped on a ship shows in the list with an “unequip” button. Gear on ships away on expeditions, and gear in Land-Based Air Squadrons, can't be used.
• Locked gear can be improved. It only needs to be unlocked when upgrading it into a different item at ★max.
• Higher stars can also require an unimproved copy of an item as material. It's consumed whether the attempt succeeds or not, so it can't be locked or starred.

The stats didn't go up after improving. Did it work?

Yes. Improvement doesn't change the displayed stats; the bonus is applied in battle calculations.

Can I remove stars if I improved the wrong item?

Since April 2026 there's a reset option, but it uses an Arsenal Resource item and can fail — so it's still better to double-check before improving.

Is there a daily quest for this?

Yes — one improvement a day counts toward a daily quest. See Daily Quests.

Does Akashi's level matter?

The wiki doesn't find an effect from Akashi's level or fatigue; what matters is Akashi vs Akashi Kai.