Yukie and her family are on a road trip touring the seaside. While her parents enjoy the refreshing coastal air, Yukie appears to be quite hot, and her mother believes that she may have a fever. However, the reality is that Yukie is far from feeling bad, as she is actually consumed by pleasure.

Oblivious to their parents, Yukie and her brother are secretly in a relationship. As immoral as it may be, the siblings engage in sexual activities daily. This journey is no exception: in public, private, and even their car, no setting is unsuitable for their affection.