Houfuku Kanojo to Koukatsu Kareshi

Ako is a normal student that suddenly remembers that in her past life she was actually a demon... and the angel who murdered her also was reincarnated in her present boyfriend, Yoshi. With their new memories, Ako decides to retaliate of her mortal enemy, but for her misfortune, she still feels enough attracted by her boyfriend.

(Source: MU)