Obsessed one with system

A guy reincarnated in demon slayer. See his journey as he got someone obsessed with him. Also Mc doesn't have a system but someone else have that. Don't worry there aren't any other reincarnated people as that is annoying. Just try it. Yandere shinobu , yandere mitsuri. Fem obanai because I don't want the poor guy to be heartbroken. . . . . . . . . . . . . . . . . . . . . Demon slayer doesn't belong to me and whatsoever.