Rougai Level: Isekai Tensei Shitara Tenchuu Shihoudai

The story follows beleaguered salaryman Kato, who is pushed into an oncoming train by his abusive boss. He awakens to find he has been reincarnated into a fantasy world as Cain, a man with the special ability to recognize elderly troublemakers with one look and assess their threat levels. He sets out to eliminate all the elderly troublemakers in this word.

(Source: Anime News Network)