For as long as she's been aware, the heroine, without a single relative, lived under care of the state. Both of her parents' faces were unknown to her.

In front of this heroine, a young boy appeared.

The young boy's name was "Hikaru". It appeared that he was the heroine's twin brother, separated at birth. He had a proposal for the heroine.

"Could you go to school in my place?"

The heroine was shocked by this crazy suggestion.

Furthermore this was an all-boys school. The only high school in this prefecture for delinquents. + More