During the first summer of their high school years, Taiyou, Kobayashi, and Taguchi arrived at Taguchi's summer house. On the beach there were gyarus and surfers having fun. But, Taiyou and his friends lose the key to the summer house. There they encounter a naked man, Kawahara Duke, asking for help. With that encounter, the summer of Taiyou and his friends starts to turn into something big.