Getsu, Sui, Kin wa Swimming

Two middle school classmates, Chiba Osamu and Arikawa Madoka, attend the same swimming lessons on Mondays, Wednesdays, and Fridays. Despite frequent encounters, they have never spoken and barely acknowledge each other. When Osamu discovers that Madoka plans to leave the swimming school after starting high school, he begins to feel something stir within him. What starts as simple curiosity gradually becomes something more meaningful. He realizes he must express his feelings to her before she leaves and they no longer see each other.