Shiki entered St.Lukeman's Academy, a high school with a bad reputation. There are too many delinquents, and Shiki, who is shy and good at studying, got targeted by one of those groups. He had to obey orders made by Kawatou, the leader of the group but he thought it's better than being kicked and punched.
One Saturday, Shiki helped a girl who was trying to get away from Kawatou's group. When he was beaten up, someone came to save him. It was Karin, the "Empress", the strongest and the most beautiful girl in his high school. The girl he helped was her friend!
Karin told Shiki that she'll teach him how to fight. In return, he'll teach her how to study.
Her lessons made Shiki stronger...will he become the strongest in the school some day? 
(Source: MangaPlaza)

Shiki, an honor student at a bottom-feeding delinquent high school, has a crush on Karin, a beautiful gal who also happens to be the strongest fighter in school. When Shiki steps up to help her against a gang of delinquents, she falls in love with him, too.
While Shiki tries to teach Fumiki to study, she teaches him how to fight......
(but she keeps getting flustered when they touch)
 
Karin's gal pals also like Shiki and try to get friendly with him. They fondle him, give him sex tips, and......
While being teased by the gals, Fumiki gains the strength to defeat any delinquent, and his reputation around schoolchanges drastically!
 
(Source: Fantasia Bunko, translated)

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