Masshiro Omega wo Hiroimashita.

A novelist β and an Ω who lost his memory. Touma, returning from the convenience store in the middle of the night, encounters an omega who is surrounded by a group of bad guys. At the moment of escaping, the omega falls down the stairs and loses his memory, so Touma decides to name him Yuki... "Touma... my... body... feels strange" Yuki's sudden heat is for Touma?!