Bokura ga Ita

Synopsis

Nanami invites Yano to her house Sunday so they can spend some time together. At first Yano declines because her mother will be there and that's "no good", but once in her room, Nanami uses this opportunity to ask Yano about his past with Yuri and it takes some time for him to give her answer. As Yano leaves, Nanami feels reassured with what he told her but still has the notion that it may not be the entire truth in the back of her head. It turns out that Yano's friend Takeuchi has been hiding the truth he knows. Nanami also discovers the truth through the rumors at school and she and Yano discuss that the past doesn't matter as long as they have the present together. The subject of having sex together keeps coming up and in the end, Nanami agrees to it.

(Source: Wikipedia)