Suiyobi 22-ji dake no kare (2021)

Both have similar vibes and concepts with a mysterious ML who begins staying over at/living with the quiet, more withdrawn FL. The two take a long time to define their relationship.

Both series focus on the undetermined nature of the female lead's relationship to the male lead. Suiyobi 22-ji dake no kare is the much more PG version of a undefined relationship, with arguably a time limit on the couple being 'together'. I also just really feel like both series have a similar vibe to them as well.

While one is dark and the other mostly fluffy, both are shorter length dramas, and have a sweet FL and a ML who likes to sleep on the FL's shoulder.

Hazuki, working for stationary manufacturer for a year, dates Satoru, held back at university. Things hasnt been going well between Hazuki and Satoru, and Hazuki starts dating Yasuda whom she met at the matchmaking party. On a Valentines day, Hazuki hands a chocolate to Yasuda which meant that he was her most favorite. In return, Yasuda gave her ear rings on a White day. But after receiving a present from Yasuda, Hazuki realizes something very important. When she opened her post after coming back from a date, there was a present from Satoru

Both are short Japanese dramas featuring an eccentric male lead who enters someone's life and lights it up with cheerfulness