All equipment Improvement through the Akashi's Improvement Arsenal require specific "helper ships" to second Akashi. Depending on the ship second to Akashi, its remodel, and the day of the week, the set of equipment that can be improved will change.

Do note that certain ships are incapable of "upgrading" some equipment even though they are able to improve them to ,
In some cases, an equipment can be upgraded into 2 or 3 different new equipment, with the helper determining the result.

The following equipment do not require any specific helper, and can be improved in all cases where they are not overtaken by other help upgrades, including when Akashi is alone in the fleet:

List of ships and their related quests

For a given equipment:

"Improvement" means that the relevant ship can only improve said equipment but not improve it,
"Upgrade" means that the relevant ship can both improve and upgrade said equipment (on at least one of her remodels),

N° 1-10

N°	Ship	Improvement	Upgrade
001	Nagato	Type 1 Land-based Attack Aircraft (Hachiman Force)	41cm Twin Gun Mount, Anti-torpedo Bulge (Large), Prototype 41cm Triple Gun Mount, 41cm Triple Gun Mount Kai
002	Mutsu	Type 3 Shell Kai, 41cm Twin Gun Mount Kai 2, Type 1 Armor Piercing Shell Kai	41cm Twin Gun Mount, Anti-torpedo Bulge (Large), Prototype 41cm Triple Gun Mount, 41cm Triple Gun Mount Kai,
003	Ise	Type 32 Surface Radar Kai, 12cm 30-tube Rocket Launcher Kai 2, 41cm Triple Gun Mount Kai 2,	Zuiun, Type 21 Air Radar, Type 32 Surface Radar, 12cm 30-tube Rocket Launcher, Ka Type Observation Autogyro, Zuiun (634 Air Group), Zuiun Model 12 (634 Air Group)
004	Hyuuga	Type 32 Surface Radar Kai, S-51J Kai, 12cm 30-tube Rocket Launcher Kai 2, Zuiun Kai 2 (634 Air Group)	Zuiun, Type 22 Surface Radar, Type 21 Air Radar, Type 32 Surface Radar, 12cm 30-tube Rocket Launcher, Zuiun (634 Air Group), Zuiun (634 Air Group/Skilled), O Type Observation Autogyro Kai, O Type Observation Autogyro Kai 2, S-51J
005	Yukikaze Dan Yang	Type 13 Air Radar Kai	12.7cm Twin Gun Mount Model C Kai 2
006	Akagi		Type 0 Fighter Model 21, Type 0 Fighter Model 21 (Skilled), Type 0 Fighter Model 32, Type 0 Fighter Model 32 (Skilled), Shiden Model 11
007	Kaga		Type 0 Fighter Model 21, Type 0 Fighter Model 21 (Skilled), Type 0 Fighter Model 32, Type 0 Fighter Model 32 (Skilled), Shiden Model 11
008	Souryuu	Type 97 Torpedo Bomber, Type 2 Reconnaissance Aircraft	Type 99 Dive Bomber (Egusa Squadron), Type 99 Dive Bomber
009	Hiryuu		Type 99 Dive Bomber, Type 97 Torpedo Bomber (Tomonaga Squadron), Type 97 Torpedo Bomber
010	Shimakaze	61cm Quintuple (Oxygen) Torpedo Mount, New Model High Temperature High Pressure Boiler, Prototype 61cm Sextuple (Oxygen) Torpedo Mount	Type 22 Surface Radar, Enhanced Kanhon Type Boiler

N° 11-20

N°	Ship	Improvement	Upgrade
011	Fubuki	12.7cm Twin Gun Mount Model A Kai 3 (Wartime Modification) + Anti-Aircraft Fire Director	61cm Triple (Oxygen) Torpedo Mount, 61cm Triple Torpedo Mount, 61cm Triple (Oxygen) Torpedo Mount, 12.7cm Twin Gun Mount Model A Kai 2
012	Shirayuki		25mm Single Autocannon Mount
013	Hatsuyuki
014	Miyuki	61cm Triple (Oxygen) Torpedo Mount Late Model, Smoke Generator (Smoke Screen)	61cm Triple Torpedo Mount, 61cm Triple (Oxygen) Torpedo Mount, 12.7cm Twin Gun Mount Model A Kai 2
015	Murakumo	61cm Triple Torpedo Mount	12.7cm Twin Gun Mount Model A Kai 2
016	Isonami	61cm Triple (Oxygen) Torpedo Mount Late Model, 12.7cm Twin Gun Mount Model A Kai 3 (Wartime Modification) + Anti-Aircraft Fire Director	61cm Triple Torpedo Mount, 61cm Triple (Oxygen) Torpedo Mount, 12.7cm Twin Gun Mount Model A Kai 2
017	Ayanami	61cm Triple (Oxygen) Torpedo Mount Late Model	61cm Triple Torpedo Mount, 12.7cm Twin Gun Mount Model B Kai 2, Searchlight, 61cm Triple (Oxygen) Torpedo Mount
018	Shikinami	12.7cm Twin Gun Mount Model B Kai 4 (Wartime Modification) + Anti-Aircraft Fire Director	61cm Triple Torpedo Mount, 61cm Triple Torpedo Mount
019	Ooi		61cm Quadruple (Oxygen) Torpedo Mount
020	Kitakami	Type 42 Air Radar	61cm Quadruple (Oxygen) Torpedo Mount