俺が童貞を捨てたら死ぬ件について

Kazuya Ichijo, a lifelong playboy, comes to after being murdered and finds himself thrown fifteen years back into his high school days. He realizes his killer was Masaki Tanaka, an old classmate whose envy of Kazuya's endless string of girlfriends finally boiled over. With a second chance to rewrite his fate, Kazuya sets out to keep himself alive by making sure the perpetually unlucky Masaki finds a girlfriend and loses his virginity before he does.