Kingyo Club (2011)

Irie plays Hiiragi Haru, a third-year high school student with no real interest in women or higher education, instead choosing to live his life idly. When he notices a first-year student named Harukawa Koto being bullied, he lends her a hand, and the two form a "goldfish club" just for themselves. While love begins to bloom between them, the bullying against Koto continues to escalate.

English subtitles can be found here: https://www.d-addicts.com/forums/viewtopic.php?f=13&t=153886&p=1843228&hilit=kingyo+club#p1680678!alt text