Tenshi wa Okaeri Kudasai

Morimoto, a high school student with a complex and extreme fetish, finds himself in a state of ecstasy on the edge between life and death. Due to his troubling habit of needing to feel close to death for satisfaction, he secretly engages in self-pleasure each day with a thick rope around his neck. One day, a man suddenly jumps into Morimoto's room through the window! With wings on his back, the man introduces himself as Tanaka and claims he is an “angel”...

(Source: Kasakura, translated)

Note: Includes three extra chapters.