Kusunoki-san wa Koukou Debut ni Shippai shite Iru

After his traumatic years in junior high school, the ultra-introvert Shizuki Keisuke decides to turn his life around, and gives himself a complete make-over for his high school "debut." His new high school life seems promising, as no one is aware of his hidden past...except for one person: Kusunoki Shizuka, who also changed herself in pursuit of a more successful high school life! As their fates intertwine, will Keisuke ultimately be able live a peaceful life in high school...?!
https://www.cmoa.jp/title/260236/