After entering university, Kitahara Iori (played by Ryusei Ryo) boarded at the diving shop "GRANDBLUE" run by his uncle, and lived under the same roof with his cousins Nanaka Furukawa (played by Asahina Aya) and Chisa Furukawa (played by Yuki Wada) who had not seen each other for ten years. He was full of expectations for his new life in college, and was targeted by the university diving club "PeekaBoo". Little did he know that he was targeted by the seniors of the club, and even his friend Kohei Imamura who loved the two-dimensional world was dragged in, so he started an absurd college life that combined diving, nudity, alcohol, fighting, delusion, and love. Why run naked in college⁉️Because crazy youth only happens once‼ ️