Tenryu Automobile Industry Co., Ltd, Hamamatsu City, 1952- 55?
天龍自動車業株式合社
Tenryu Automobile was a loom manufacturer that, like so many other companies, decided to jump into the motorcycle business in the very early 1950's. I think only two models were made: the Leader (リーダー号) which was a 248cc ohc single cylinder 4 stroke, and the Hope Star model L (ホープスター号) which was a 148cc sv, single cylinder 4 stroke.
Note that 'Hope Star' was also the name of a three wheeled vehicle made by Hope Co., Ltd, in Tokyo.