Yoshino Hide is an average girl who always seems to find trouble wherever she goes. One day Yoshino visits a local shrine to pray in order to pass her upcoming test. However, Yoshino sees a blue light coming from inside the Shrine and looks inside to find a mysterious person performing a magic spell. In a stroke of bad luck, Yoshino trips on a small bell and crashes into the shrine, prompting the stranger to catch her. Upon Yoshino's capture, the magic spell spirals out of control and sends Yoshino back in time to the Sengoku Era. Yoshino then encounters Akechi Mitsuhide and Oda Nobunaga. But unlike what really happened during the era, Hideyoshino realizes that everyone in the world is female. She then decides to help Oda Nobunaga find the Crimson Armor which is said to allow the person wearing the armor to conquer all of Japan.

Takashi Kamiyama is your typical mild-mannered high school student—polite, aloof, and pacifistic, with a slightly above-average IQ. But would your average high school student really enroll himself at the infamous Cromartie High School, known as a breeding ground for the toughest delinquents out there? Apparently so, as that is exactly what Takashi does, though for reasons he'd rather leave unmentioned. However, one thing is for sure: the "hard-boiled rabbit in a den full of hungry lions" is never going to have another dull day. And how could he, now that he's surrounded by mohawked punks, obnoxious robots, and... gorillas? And was that Freddie Mercury riding a horse down the corridor? Follow Takashi as he earnestly dedicates his new high school life to better his school's reputation while his classmates are hellbent on wreaking havoc.

Specials released with the Blu-ray/DVD volumes.

The famous cheerful guy, Saikawa had tried to rip off the gloomy kid, Sayama's mask. After that day, he had captured Saikawa's attention and Saikawa had volunteered to teach him for the upcoming examination but with one condition, Saikawa can do whatever he wants with what is hiding under Sayama's mask. He hates it when people touch his bare face, lips and inside his mouth, but he cannot say anything when Saikawa touches them. With the combination between Saikawa's harassment and the awkward mask boy's behavior, this manga will be packed with sexual tension between these two.