Ano Hi No Kiss Wo Mou Ichido summary:

"What would've happened to us, if we hadn't kissed that day?" Miho, who's never been good at making friends, shows up to an alumni meeting in hopes to see his old former friend, Hiroya, one more time. They fell out of touch due to certain reasons, but Miho's determined to put his fleeting crush past him and rekindle their friendship. But when Hiroya says that was married and got divorced, Miho can't suppress his shock. Taken aback by the fact that there is much of Hiroya he doesn't know, he sneaks out of the rowdy reunion venue only to be chased after by Hiroya...!+