One of the boys is wearing only a thong bottom, showing the butt.

Two boys (8 and 6) nude for their bath.

Sakuzo (Taiji Tonoyama, 10) and his mother have a bath together (full nudity). In that same scene, Sazuko's mother gives his penis a little kiss.

Sakuzo and some boys swimming and playing in the lake wearing loincloth.

Later the kissing part of that scene is shown again, a little closer up and in slow motion.

Sazuko's sister (Mami Okamoto, 13) is topless with him in a river.