You have been staying in Japan after traveling for a highly advanced medical procedure. Your only friend, Koyomi, sees how isolated you have become here, and is encouraging you to get into dating. She offers to introduce you to the sweet, normal, well-adjusted single guys she knows in your apartment complex. But for whatever reason, she doesn't seem to want you to meet Kage, your next-door neighbor."There's something really off about him. If you decide to talk to him, obviously I can't stop you. Just...please be careful. He's really...fragile."Every choice you make with/towards your yandere neighbor will have a disproportionately larger impact on him than all the other dating "options," for better or worse. Also, be careful about the other "options." Every choice you make with them also affects