The story centers on the romance between Yoshiyuki and Yuzu, both attending the same college. Yoshiyuki desires to deepen their relationship, but Yuzu, who has a tsundere personality, lives with a guarded heart. Despite being lovers, Yuzu's innocence causes him to blush and act like a boiled octopus from just a simple kiss. Eager to experience passionate moments, Yuzu promises Yoshiyuki something explicit during the first month of dating.