BATSU

Kimura was an ordinary but happy salaryman living a happy married life with his wife and children. However, one night, his family's lives were taken by a group of three underage robbers. Kimura fought back desperately, killing two of the perpetrators. This was deemed excessive self-defense, and Kimura was arrested. Ten years later, having served his sentence, Kimura sets out to hunt down the third perpetrator he missed... (Source: Natalie, translated) — Description from AniList community (anilist.co).