Based on the otome game, Kenka Banchou Otome.
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. Hikaru was part of the most ancient and honorable family in the criminal underworld (yakuza), the Onigashima family. Under his father's strict teachings, the school that he was to attend had been decided. And that school was Shishiku Academy. A high school where all the terrible and wild delinquents were gathered. Enrolled in this school, a child of the Onigashima family was obligated to occupy and control this school. Hikaru did not want to have anything to do with delinquents. But to defy his father meant death. Hikaru, who learnt about his twin sister who was separated from him at birth, was struck with the idea to send her in his place to this school of delinquents.
(Source: VNDB)
Hinako Nakayama is an orphan and a martial arts expert, who was living her life in a fuzzy haze when she finds herself attending a new school. While the new outlook she gets from her new surroundings is great, there's a few problems: 1) Its an all-boys school 2) Its student body is nearly 100% punks who are ready to brawl at a moment's notice and 3) She's attending under an assumed identity that ensures the toughest are all going to be gunning for her!
Hinako reaches the next hurdle in her quest to take over Shishiku Academy: Takayuki Konparu. The only problem? The steely first-year has no interest in fighting her!
Konparu has sent a letter of challenge to Hinako and is now out for her blood. Why is he suddenly ready to fight her? And can Hinako win the fight when she learns the truth?
One of the two top second-years, Yuta Mirako, is both an idol and a brawler. An upcoming concert at Shishiku Academy brings him into conflict with Hinako.
The other top second-year student, Rintarou Kira, seems to know Hinako's real identity. How does he know, and what will it mean for her conquest of Shishiku Academy?
Kira seems to know who Hinako really is, and wants her to give up her conquest of the school. It seems the only way for her to convince him otherwise is to fight him... and win.
Rumors are starting to spread about Hinako's true identity, and if something isn't done soon to quiet them, she risks her own school turning against her. Luckily, she can still rely on her friends.
When Hinako Nakayama took on the identity of Hikaru Onigashima, she didn't know what it would mean for her future. Now, with the support of the friends she's made with her martial arts skills, it's time to prove who's the boss of Shishiku Academy!
