Slice of life books by Japanese authors under 300 pages?

Hi, I'm looking to get into reading and I want to get a fiction novel under 300 pages for casual reading.

I have read Convenience Store Woman and Before The Coffee Gets Cold which I really enjoyed. So I'm interested in more books like these 2.

Not looking for anything focused on romance, and I like them a bit gloomy. About loneliness is a plus point. Also would prefer to read something else first before grabbing the sequel to Before The Coffee Gets Cold.

I found Days at the Morisaki Bookshop, but still looking for other recommendations.