Koushi Shirota

A high school student who becomes involved with Takane as her "closet", where he has to replace her underwear whenever she removes it. He is the only one who has seen Takane naked and is thus able to go back in time whenever she has a do-over. At first, he did it because he did not want to be criminalized for appearing to have sexually assaulted Takane. Ch. 1 He soon takes his task seriously to protect her from embarrassment and later tells the reader that he was unaware of her romantic intentions back then.

(Source: Please Put Them On, Takamine-San! Wiki)