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Prototype Shuusui

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Prototype Sharp Sword
No.351 試製 秋水
Interceptor Fighter Icon.png Land-based Fighter
Effects: AA+2 Anti-Bomber+8
Combat Radius: 1 (Deployment Cost: Bauxite 4)
Scrap value: Fuel 4 Ammo 3 Steel 1 Bauxite 6 (Unbuildable)

Equipment Card Prototype Shuusui.png

Equipment Character Prototype Shuusui.png

Equipment Item Prototype Shuusui.png

Equipment Full Prototype Shuusui.png

Refittable Ship Types
Fast Battleship Battleship
Aviation Battleship Standard Aircraft Carrier
Armored Carrier Light Carrier
Heavy Cruiser Aviation Cruiser
Light Cruiser Torpedo Cruiser
Training Cruiser Destroyer
Coastal Defense Ship Submarine
Aircraft Carrying Submarine Seaplane Tender
Fleet Oiler Submarine Tender
Repair Ship Amphibious Assault Ship
LBAS Plane



This is the world's first mass-produced rocket-powered fighter developed and put into service by the Country of Science.
This is a Japanese-made prototype rocket-powered fighter developed jointly by the IJA and IJN based on valuable, but incomplete, blueprints brought back by the I-class submarine.
It was made to intercept heavy bombers at distant, high altitudes that were difficult for regular aircraft with reciprocating engines.


Land-Based Fighters/InterceptorsLand-based FighterLand-based FighterLand-based Fighter Jet are LBAS exclusive fighters, that are used to either:

  • Provide Sortie Fighter-Power, where the "fighter Power" Anti-Air, "interception" Interception, and "combat radius" Operation Radius stats are the most important,
  • Intercept enemy bombers, where the "fighter Power" Anti-Air, "interception" Interception, and especially the "anti-bomber" Anti-Bomber stats are the most important.

Prototype Shuusui is considered in-game as a high altitude interceptor.

  • High Altitude Interceptors multiply the total air power of all land bases in Air Defense mode, when defending against enemy High-Altitude Bombers. The multiplier depends on the number of high altitude interceptors equipped and which difficulty the event map is played on:
Land-based Fighter High Altitude Interceptors
Equipment Card Me 163B.png
Me 163B
Equipment Card Prototype Shuusui.png
Prototype Shuusui
Equipment Card Shuusui.png
Airpower modifier against high altitude raids:
Event Map
Number of High Altitude
Interceptors Defending
0 1 2 3+
Casual/Easy: 1x 1.1x 1.2x
Medium/Hard: 0.5x 0.8x


Not to be confused with other aircraft of this family (see here).

How To Obtain

From quest: B153 (choice)

Ranking reward for:

  • Jul 2019: 1-5, 6-20, 21-100, 101-500

Event reward for:

Updates History

  • 2019-08-28: Implemented as ranking reward


The depicted plane is allegedly the J8M1/Ki-200 variant (did not exist/enter service as is).

See Also