Tatsumiya Tomoki, a college entrance exam retaker, moved in with his mother's family to attend prep school.
Greeted by— His mother's sister, Aunt Azumi, a lawyer, and her younger sister, the homely Aunt Mahoro.

A new life begins under one roof with these beautiful sisters. Of course, things couldn't go smoothly...

“This is just between us, okay? Don't tell Mahoro either...?”

“This is just our little secret... right~? Please don't tell our sisters~”

Before he knew it, he was sharing a “secret” with both of them. And every night that came, he found himself increasingly bewitched by his two aunts.

[From official site]