[1] In November 1941, development began on an anti-aircraft version of the Type 98 with a 20 mm AA gun.

[1] During development of the AA gun tank, the Imperial Japanese Army experimented with various configurations.

An earlier produced prototype was designated the Type 98 Ta-Se self-propelled anti-aircraft gun in November 1941.

[1] It mounted a single converted Type 98 20 mm AA machine cannon in a cylindrical turret.

[1][2] The twin gun was similar to the Type 98 anti-aircraft cannon, but these could be elevated to 95 degrees and had a central fire-control system.