北原伊织（龙星凉饰）在升上大学后，寄宿在叔父所经营的潜水商店「GRAND BLUE」，并且与相隔十年不见的表姐妹—古手川奈奈华（朝比奈彩饰）和古手川千纱（与田佑希饰）同住一个屋檐下生活。对青春大学新生活充满期待的他，被大学潜水社团「Peek a Boo」盯上，殊不知被社团前辈盯上，连热爱二次元世界的友人今村耕平也一起被扯进来，于是展开了一段结合潜水、裸体、酒精、打闹、妄想、恋爱的荒谬大学生活。
为什么在大学里全裸狂奔⁉️ 因为疯狂的青春只有一次‼ ️

When Chihiro was a baby, she suffered from eczema. Her parents tried to find a cure, but nothing worked. Her father's co-worker then gave him some water from a strange religious group. Chihiro was miraculously cured by the water. Her parents began to follow the strange religion and became fervent followers. Chihiro is now in the 3rd grade of middle school and she faces changes in her life.