ブラックシープ

To all the black sheep, resist your fate. Shizunaga Rei, the son of a powerful yakuza boss, lives as a regular high school student. But one day, his father is attacked by hostile forces, and Rei is suddenly appointed as the acting leader. Unexplainable events begin to unfold around Rei, and alongside his secretary, Ouga Masumi, Rei witnesses the reality of the organization’s society—?! (Source: Kadokawa, translated)