My Yandere Girlfriends and Me

Mu Cheng is ordered by a demon to conquer other girls.

He thought this would be his last job.

But then, to his surprise, the memories that his former girlfriends were supposed to have had erased seemed to return?

And most importantly:

"What the hell? The girls I conquered before were all yanderes!"

So, for the sake of his own safety and to help his yandere girlfriends reshape their personalities, Mu Cheng sets out on his sweeping conquest once again!