Adult PC Game: Dissonance Ver.3 by Glephy Archive

A year apart puts a strain on any relationship, Jeremy knows that, but the reward for that sacrifice; a lifetime of security and happiness for him and the love of his life proved themselves too tempting.
So he took the leap. He packed his bags and moved away, leaving behind a girlfriend who's due to follow him right after she graduates in a year, a bubbly, albeit spoiled best friend, and a rebellious little sister.
It won't be easy, yet he's okay with that.
Distance won't break the strong bonds he's built with all of them.​