Grim Reaper and Four Girlfriends

死神様と4人の彼女

Kaoru Minaguchi is unremarkable at everything and bullied for loving shoujo manga, until a shinigami named Airi arrives to claim a life she has written off as a failure. With his last breath he swears he will become a success, and she gives him a reprieve on one condition: he must prove it. To do so, Kaoru sends love letters to four different girls and, to his shock, all four agree to date him, while Airi watches over the next three months to see whether he can keep his word.