Dainippon Kikai Kogyo Co., Ltd., 1951-53
Dainippon Kikai produced at least a couple of models. The 150cc machine called the Hikari (ヒカリ号) in 1951, as well as the 1953 Lightning (電光号) which was a clip on. I haven't identified the engine they used.
The company also imported and sold Kreidler machines from Germany in 1952, specifically the K50 Kreidler Army Moped, as seen in the middle of the scan below.