Kyotarou does not bring an umbrella at all even if he enters the rainy season. Ryoma puts in Kyotarou with an umbrella, but Ata of the student organization who sees such a situation gently clasps his fist. The Defense Department enjoys a relaxing time after school at Kurotamayu, and a suspicious shadow that shows the situation from behind. The Defense Department is impatient with "Molester⁉", but the suspicious shadow is that he was a student at Eyebrow High School who wanted to get along with anyone because he saw the Defense Department that seemed to be free.
梅雨シーズンに突入しても一向に傘を持ってこない鏡太郎。龍馬が相合傘で鏡太郎を入れてやるが、そんな様子を目にした生徒会の阿多はそっとこぶしを握りしめる。黒玉湯で放課後の憩いのひと時を楽しむ防衛部、その様子を陰からうかがう怪しい影……。「痴漢かっ⁉」と焦る防衛部だが、その怪しい影は暇そうな防衛部を見て、誰でもいいから仲良くなりたいと思っている眉難高校の生徒だった……。
É a estação chuvosa, e Ata, do conselho estudantil, está zangado com Kyotaro por não trazer o guarda-chuva e Ryoma por deixá-lo usar o dele. Enquanto isso, um estudante estranho tenta fazer amizade com o Clube de Defesa…
