Prototype Mountain Haze
|Coastal Defense Ship||Destroyer|
|Light Cruiser||Torpedo Cruiser|
|Light Carrier||Standard Carrier|
|Armored Carrier||Seaplane Tender|
|Submarine||Aircraft Carrying Submarine|
|Submarine Tender||Fleet Oiler|
|Repair Ship||Amphibious Assault Ship|
This is a prototype of the catapult-launch capable high-performance attack aircraft, "Seiran". Developed as a strategic operations seaplane that could be carried by submarines, it is a high-specification aircraft with unexpected attack power. When those submarines have appeared to you, equip it by all means!
Event reward for clearing E-1 of Christmas 2013 Event
Stock equipment for I-401 Kai and I-14 Kai.
- This is the first equipment that have to have the ( 試製 lit: Prototype ) designation in their name, with the stats far beyond that of conventional equipment.
- The Seiran was designed as a submarine-carried seaplane bomber for use against the Panama Canal to disrupt US Navy logistical capability between the Atlantic and Pacific Oceans. The Seiran never saw any action however due to Japan's surrender, and most of them were destroyed at the end of the war to protect the IJN's secrets.