[I'm the Big Brother] The Retired Underworld Boss's Quiet Life

After inheriting his father's position as head of a family that had led a yakuza gang for generations, Muto Sawahito is overwhelmed by the immense pressure and becomes deeply depressed. One day, he makes plans to escape and unwind, so he follows his younger brother, Ino, to a remote place like Chiba. Since Acorn has to go to school, they go to Soft High. Sawahito is only there to relax, but he gets bored with nothing to do. While wandering the streets, he comes across a recruitment notice for Kai-Kyu High. Looking for some fun, he tells the school that he doesn't need a salary. Of course, he probably wouldn't be very good at the job, but the school agrees anyway. He becomes a first-year teacher there and meets Tomoji Katagiri, who is just starting his first year of high school.

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