Osananajimi dakedo Seiteki ni Suki desu.

Souta and Mitsuki, childhood friends who've been very good friends since kindergarten, are now in their adolescent years. One day, Mitsuki comes to complain to Souta after hearing their classmate boast about losing his virginity. Reasoning that there's nobody else he can ask, Mitsuki suggests practice-kissing with Souta! Souta acts indifferently...