Due to the remarriage of his father Rintaro, Hinata Youhan moved into Asahina's house. Faced with beautiful men with different personalities, Youhan expressed his calmness about this.
But the men of the Asahina family were not calm anymore - "Sister-chan, I love you!"
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CP is undecided (probably NP), there is a one-on-one story, the heroine is an evil killer, has evil taste, likes to play with other people's feelings, likes to watch others love her to death, is good at provoking wars, and doesn't like to get involved by mistake.
The introduction is incompetent, please read the text.
Ps: Irregular updates, one chapter for 3 days during summer vacation, and weekly updates during school.