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.