Green waves

A young woman in a green swimsuit stands in a pool, adjusting her goggles with a determined expression. The scene cuts to a group of students, then to two girls in bikinis on a beach, one with red hair and a red top, the other with long blonde hair, as the red-haired girl pulls at her top. The sequence ends with a close-up of hands gripping the red fabric, followed by a shot of a girl with pigtails and glasses looking surprised against a backdrop of cherry blossoms.