Astraeus's manga / #university(2)

I originally put 4 stars but i dont remember why Cuz their personalities are meh and it doesnt feel like their relationship has fully developed A guy coming from the country wants to greet his neighbour, but hes actually having sex with a girl and greets him fairly impolitely. He decides to not bother with him anymore, but the two of them seem to always cross paths one way or another