College student Itsuki is a smart, handsome guy, but he doesn't know his birth identity, so people around him keep saying he might be an alpha. One day, he meets an alpha who descends from above and says, "Be mine!", which makes Itsuki furious. But he ends up having to share a room with the rude person, Rinku!? Every day, Rinku approaches Itsuki, saying he fell in love at first sight, but Itsuki is cold towards him, but he reacts to Rinku's birth identity, even though he's an alpha, and turns into an omega!?