Hot Gimmick (2019)

Both are about a group of high schoolers who grew up in the same apartment building and are now involved in a web of romantic/sexual relationships with dark emotions and motivations being rampant.

Although the type of story is different, both have a male/female power struggle as well as the fact that both "Hot Gimmick" And "5 to 9" are based on mangas written by the same author, Miki Aihara

it focus on artistic part. the plot/story is not easily understood. most people may find the movie boring.

If the master/slave or dom/sub dynamic is your vibe, definitely check out Black Devil, along with its special (watch it first).

Master/slave power dynamics in both of these Japanese movies. 100 Days is more debt-based, and the ML is older.

written and directed by the same person, so it has similar vibes and aesthetic. imo drowning love have a better plot, even though its just as weird.