Kagaku-bu no Megane

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 is not quite sure what a "boyfriend" is, while Sako 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.

(Source: Akaneshinsha, translated)