As a gravely ill boy lay on his deathbed, a spirit named the Yandere Development System bound itself to him and took him back to the past...
To survive, he kept conquering the girls around him, until he had turned them into proper yanderes.
But after he successfully shaped three girls into exactly what he needed, he met a girl he truly wanted to protect.
Torn with regret and heartache, he forced himself to stay away from her, but how could he take his eyes off a girl as angelic as she was?
Just as he was wondering whether to give it all up, the girls he had conquered came looking for him.
"Chen Yumo, I want to be the only one in your eyes..."
"Brother Yumo, didn't we promise to be together forever?"
"Someone left a scar on my heart. Now it's time to make him pay!"
Facing the girls' yearning gazes, Chen Yumo could only place his hopes in the System.
"Come on, Host. I've always believed in you."
