Ran Haitani goes back to the past exactly 10 years ago to save his and Rindou's ex-girlfriend.

(Y/n) never minded his quiet life. Most days he would be off in his own world, ignoring the real one. When he accidentally runs into his best friend's stalker, (Y/n) watched his peaceful life go out the window. Now, he has a choice. Either help this crazy yandere get with his best friend, or probably die. Though, the choice might not be his to make.