It is the source of the name of the rebellious taiyōzoku (太陽族) youth culture which emerged after World War II.

[3] Tatsuya Tsugawa, a college student who enjoys boxing, meets Eiko when he and his friends pick up some girls.

Tatsuya and Eiko start casually dating, and he finds himself emotionally attracted to her, declaring his love by poking a hole through a shoji screen with his penis.

One night, while sailing on Tatsuya's boat, the couple makes passionate love, awakening Eiko's feelings for him.

After seeing Eiko's photograph at her funeral, Tatsuya interprets her smile as a challenge and angrily throws a container of incense at it.