Hinako thought she didn't have any family, but on the day she starts high school, her twin brother Hikaru suddenly appears and tricks her into taking his place. But the new school Hinako attends in his stead is beyond unusual. Now she must fight her way to the top of Shishiku Academy, an all-boys school of delinquents!

Hinako takes her twin brother Hikaru’s place at Shishiku Academy for boys. Fights break out every day, but there are also lots of heart-palpitating events with the boys that she never expected! And as the battle to be the boss of the school rages on, will Hikaru make it to the top?