|School||Fujou High School|
Ōsaki is a student at Fujou High School when the tournament game school competing for Roka's Bag, he was cast as reserve contestant, because Kenji had been knocked unconscious after being Takao's zipper bust shot.
He then became part of the Allies of Kazama Gang.
- Just like other characters' in D-Fragments series, their names are reference to railway stations in Japan. His name is derived from Ōsaki Station.