Hachigatsu Kokonoka Boku wa Kimi ni Kuwareru.

Story

My grotesque (stalker), protects me from 100 stalkers in order to eat me. Sakurai Aoi, a high school boy, has a secret that he can tell no one. He's been a victim of stalking since childhood. One day Ueda Miyako, a classmate, suddenly turned into a monster. She was the one who was stalking Sakurai. The beautiful Miyako, who has been around Sakurai for a long time, was taken care of, but the monsters in urban legends all over Japan are stalking in order to love themselves. The fate of Sakurai, who is loved by the mysterious name of hundreds of beautiful women, is...

Inhaltsangabe via AniList (Englisch).