One day in March, Jin Ikawa visits his father, who currently works alone from Nagoya, during his spring break. However, the father of a professional photographer goes on a business trip due to a sudden job. Jin takes a walk on the beach with time to spare. Then, I ran into a fighting surfer and his girlfriend, and I was forced to drop a surfboard from my boyfriend who was chasing her. In trouble, Jin, who was looking at the flying kites, got off and fell into the sea. It was Chika, the only daughter of the Kumagiri family, who appeared there after getting soaked and getting up from the sea. When she fell, she dropped the key to her father's apartment into the sea and had trouble knowing where to go. What appeared there ... Nagisa. Is this encounter a coincidence? It is inevitable.The awkward and frustrating youth between Nagisa, Jin and the people around them begins ...