Yes, this is what my source (nearly completely) says too: Aichi Giant Star AA5B, 1952 by Aichi Machine Industry Co. Ltd. (former Shin Aichi Entrepreneur Co. Ltd., 1947-1952).
The source additional mentions, that the Aichi Giants were the first Japanese commercial threewheelers with fully enclosed bodywork
Attached another (better) picture of the puzzle-car and of its predecessor