Eighteen Years, to the Sea (1979)
Original title: 十八歳、海へ
Eighteen Years, to the Sea is a 1979 Japanese-language drama movie directed by Toshiya Fujita, with a running time of 1h 50m. It stars Aiko Morishita, Toshiyuki Nagashima and Kaoru Kobayashi.
Kei and Atsuo were both enrolled in summer school. Kei was an honor student, and Atsuo was the polar opposite - but opposites attract. After school, the two head to the beach, where they find another student from their school competing against a local gang member, to see who is able to hold his breath longer under water. Overwhelmed by the excitement, Kei and Atsuo decide to try themselves.