Hitorijime My Hero
ひとりじめマイヒーロー (original)
High schooler Masahiro Setagawa is a fairly helpless delinquent, so much so that the neighborhood bullies use him to run their errands. His life changes when he meets high school teacher Kosuke Oshiba, a man whose fighting abilities have earned him a powerful reputation on the streets. Oshiba finds himself with a desire to protect Setagawa, and despite swearing that he's not interested in men, Setagawa finds himself getting more involved in Oshiba's affairs.
Watch "Hitorijime My Hero" from streaming services Amazon Prime, Amazon released in 2017. It's a animation and comedy show, and has a rating of 7.4 out of 10 from Imdb which is usually fine for this kind of show.