"Are you really fine with me?" "If I wasn't fine with you, I wouldn't have asked in the first place." "But isn't that the same as what we've already been doing?" "Yeah, so we can also add kissing." Two members of the chemistry club promised each other that they would go from friends to lovers at the summer's end of their sophomore year. Akui (black full-framed glasses) is not quite sure what a "boyfriend" is, while Sako (light-rimmed glasses) seems cheerful, even though he insists it's just an experiment. The four-eyes of the chemistry club are clumsy but sincere in their first experience of experimenting with love.