After graduating and becoming a corporate drone, Natsume is suddenly approached by a strange creature claiming to be a conquest System.
After being forcibly bound to it, he returns to his college years. The Fujiwara couple suddenly have a distant relative living with them, and he will spend the next four years of college at the Asahina household.
His new younger sister is the heroine of a conquest game, and all her other brothers are part of her harem.
Natsume: Am I supposed to join in too?
He grits his teeth and spends time with the heroine, while the other brothers' affection meters turn red and keep climbing.
Natsume feels the brothers' gazes growing more and more terrifying. When their red hatred meters finally hit 100%, he can't help asking the System for help: You'll guarantee my safety, right?
The System stares at the overflowing affection meters in silence. "Those aren't hatred meters! They're horny meters! Run!"
Theme: Sooner or later, you'll meet that ray of light. It may be early or late.
