Aoki, a member of the professional swimming team, was dating his senior Himori. On a bus during a trip, Aoki secretly performs oral service to encourage her slumping boyfriend. However, her teammate Shiomi witnesses this and uses it to blackmail Aoki, stealing her away. Overconfident, Shiomi proceeds with the act beside the exhausted and sleeping Himori on the bus, driving Aoki into a frenzy of pleasure...
