Prototype Southern Mountain
|Coastal Defense Ship||Destroyer|
|Light Cruiser||Torpedo Cruiser|
|Heavy Cruiser||Training Cruiser|
|Aviation Cruiser||Fast Battleship|
|Light Carrier||Standard Aircraft Carrier|
|Armored Carrier||Seaplane Tender|
|Submarine||Aircraft Carrying Submarine|
|Submarine Tender||Fleet Oiler|
|Repair Ship||Amphibious Assault Ship|
The "Seiran", a high-performance carrier based dive bomber, developed as a strategic operations seaplane that could be carried by submarines. The "Nanzan" is the land based version and an arresting hook was added to this prototype carrier based bomber version. Since it is a test machine, it has an ostentatious paint scheme.
- July 2015 Ranking Reward for all tiers.
- August 2015 Ranking Reward for Top 5 and 20.
- January 2017 Ranking Reward for all tiers.
- Quest B129 offers this as a choice between three rewards.
- The land-based trainer version of the M6A1 Seiran. Its orange paint is an indication as a trainer plane, however this was changed later to a 2-tone color.