Because Ah Meng (Yituokada) won the lottery but did not win, the Plastics Department was responsible for cleaning the swimming pool.Worried that the number of people was too small to complete the cleaning of the swimming pool, seutruka (Tsukii Ayama) and takarka (Kaki Haruka) asked for help from Kotobu and Rei (Kobayashi Mako) respectively, but were both sunk...
Under such circumstances, A Meng proposed to fight against racing!Under the rules of losing clubs cleaning the pool, other clubs were also involved, and the midsummer pool competition opened!