remember watching an anime eerily similar to this
iirc meek guy gives a "wandering beauty" who he's never spoken to before an umbrella.
to show gratitude, she visits his dirty place, helps him clean, even cooks for him (he pays and helps her shop too)
that? was pretty meh after awhile
this? this is much worse from the start
the girl basically yells out in class that the MC let her use his shower for all to hear
-and while rumors are spreading to the MC's dismay, she's pretty oblivious (almost like they exist in 2 separate dimensions)
but 2 chapters later she is worried that her little sister's bratty attitude would give the MC the impression that she is also a spoiled brat
-she was so worried she was on the verge of tears and needed a headpat... same girl lacking social awareness
its got a 8.73/10 so its somehow made sense to a decent number of people
on the FMC's cute imouto, only 5~ pages in to her first appearance and she's trying to blackmail her sister into kissing the MC and passing relationship advice (all while she looks like shes 8 anime-years old at best)
// earlier that same day the MCs teacher, who seemingly knew nothing about him, singles him out and just straight up tells him to shag the FMC because he's the only male at school that she's remotely comfortable around.
[/EDIT] *might i add, the assumption here is that she's had some traumatic experience involving a man, award winning teacher [/EDIT]
so if our loner MC doesn't talk to anyone... "someone" is going to force their way into his life to try to convince him that he should get with the FMC