Chapter 2
Sub, who wants to be a Dom who wants to dominate people, a world where "second sex" exists. Masami, who works at a sub-only club, is ordered by Yusei, a transfer student...!?
Chapter 2.5
Chikara is a university student working hard on his research for his childhood dream, hoping to someday achieve flight. One night, he witnesses the secret on the back of Satomi, a transfer student with a perfect body and face. The two quickly grow closer, but there is a side to Satomi that Chikara does not know. A story of darkness, hope and rebirth on the backs of two young men.