The MC is confessed to by his friend in high school and the two start dating because the feelings had actually been reciprocated for a while before the confession. Things get hot and heavy between them, as high school boys will, but the MC tends to put his foot in his mouth at crucial moments and the two generally don't communicate enough so they end up breaking up in a fight and the MC's significant other moves away. Fast forward a number of years (3?) and we're told from the MC's point of view how much he regretted what happened and how badly it has effected his life since then. He is still in love. The two happen to meet again at a cafe and explosive emotions lead to the MC trying to apologize only to be told that he wasn't being blamed and that the encounter helped him (jin, the MC's significant other) get to where he is now as an adult and that he is thankful for it. This has the MC feeling like he's the only one who cares to fix things as Jin has seemingly moved on (though clearly not really as he still has memorabilia of their relationship that he keeps on his person). Great read so far, looking forward to more.
Zutto Kitto