Kasai Yuuto’s school life was one of solitude.

A little after entering his second year of high school, his parent’s sudden remarriage resulted in him getting a new stepsister who was around his age.

That stepsister turned out to be none other than his classmate who sat next to him, the school’s idol, Hina Saijou.

She often spoke to Yuuto, who usually kept to himself. For him, those brief moments with her brought a great sense of peace.

From here on, surely, they would enjoy a happy life together as family…

“Hey, hurry up and make me some food.”

“Sigh, yeah, yeah.”

But standing there was a completely different Hina from the school idol he knew… a troublemaker.