In Mishima City, Shizuoka Prefecture, there are three high schools, namely the prestigious Jundou West High School, the Mishima High School affiliated with the University of the Colorado, and the all-girls church school, the Santa Mishima Girls' College. Due to the incident caused by the chapel fire that year, the neighboring Donggao and the three girls hated each other and were irreconcilable. The three girls, who were heavily in debt, faced the fate of bankruptcy, so rumors about the merger of the three girls and the Buddhist Donggao were rampant. Hara Heisuke (played by Ryo Nishikido), who taught at Donggao, combined his student experience and proposed the idea of setting up a male and female experimental class. Although the heads of both schools were not very cold about it, they still passed the plan with the attitude of giving it a try. After that, Heisuke and the three female life instructor, Fengya Lisa (played by Mitsushima Hikaru), who was known as the Dark Tiger, brought their students to the other side's camp. The boys and girls who originally hated each other will stage a series of interesting and touching stories...