Mizuho begins her journey toward better fitness when her boyfriend Hiro proposes swimming lessons at the pool after hours. Though initially hesitant due to her limited swimming ability, she agrees, leading to sessions that quickly become charged with excitement amid the water and swimsuits. Meanwhile, Takuya finds himself entangled in an unexpected situation with his charming but accident-prone neighbor Sayaka. This first episode sets the stage for intimate aquatic encounters that blend romance and sensuality.
