After his parents reconciled, Sakura Takahiro, a student preparing for university entrance exams, was forced to live with his sisters again, but he hadn't seen them at all in the past eight years... This reunion was sure to be a very touching one, but... the eight-year gap was huge, and they had both grown so much that they were unrecognizable, so... in the end, it turned into a very erotic reunion... "Come to think of it, I was the youngest child, so when I was little, my older sisters used me as a "toy"... Suddenly, forgotten and nostalgic(?) memories come back to me... I wonder if I can study properly for the entrance exam here..." Under the same roof... With a hint of anxiety and naughty fantasies, an exciting life begins now!!! Thus, he will drown in his sisters' charms! He knows his sisters will be the death of him. The summer of "older sisters squeezing their little brother" is coming, with death by smothering all but inevitable.