Unless I'm misrembering, a part that people seem to forget is MC getting annoyed at other boys pushing their feelings on the FMC when they were younger and assuming she felt the same way. So take his low self-esteem already and add the doubt of "what if I'm just pushing my feelings onto her and...
I disagree with the harem tag on this, since Justy & Hel show no interest in anyone else and immediately after showing up every other woman supports those two together
I gotta give Mini props for immediately asking if Runa was Chi's gf rather that waiting and letting the misunderstanding cont
(Also I'm just writing Chi for the dude bc we all know he's her friend from the past, right ;)
I was really hoping the last page would be the sisters walking back and in the background the MCs were doing something really coupley that they just missed