Kirei Ni Shiteyo

Kirei ni Shiteyo manga summary: From Exiled Rebels Scans:
The thing Hara Dai hates the most is people. To him, every single person is troublesome. He was bullied and bothered so much throughout middle school that he debuted as a delinquent in high school. However, whether he’s plain or flashy, it seems the only person who isn’t bothersome is the janitor.