Uwaki to Honki THE ANIMATION

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Sasahara's world comes crashing down when he happens to see his girlfriend Riko kissing another man in public. Sasahara's friend, Mika, tries to console him during a night of drinking. They later realize that the man Riko was being unfaithful with was Mika's own boyfriend. After that, Mika learns that poor Sasahara is still a virgin. In the heat of the moment, she decides to break up with her boyfriend and try to make both feel good again, by taking Sasahara's virginity. A short tale of broken relationships, cheating, and the search for true love. (Source: J-List)