Harame ~Ore wa Kono Gakuen de Fukushuu o Nashi Togeru~

Rokuya's family used to be rich. However, when he was a kid, his parents were fooled and they lost everything. Since then, he keeps a grudge against a man who took everything from his family. One day, he starts working at a high school and finds out that the boss of the school is the man he looked for. He somehow keeps his cool, but he decides to take revenge on him...