Uzaki, despite being a small-framed young woman, is curvaceous and possesses a large chest which is further accentuated by the words "sugoi dekai" meaning "very big" or "great."
While trying to smash a watermelon blind-folded, Shinichi accidentally knocks Uzaki down and unwittingly gropes one of her breasts mistaking it for the watermelon.
There are a few sex jokes. One in particular being when Hana accidentally gets herself stuck in a bush and forces Shinichi to get her out. While stuck, there are a few shots of her undergarments leading Shinichi to smack her rear so that her skirt covered it. Worse, Hana unwittingly says a few suggestible words and two women walk by noticing that Shinichi's crotch was close against Hana's posterior leading to a misunderstanding.
(Deleted. Personal opinions about suitable viewing ages are not appropriate for the Parents Guide.)