R-15

R-15 is a light novel series that received an anime adaptation which aired in 2011.

The story follows Taketo Akutagawa, a boy who attends a school for geniuses: Inspiration Academy Private High School. Taketo happens to be a genius novelist who writes erotica despite the negative reactions it brings and the bad perceptions people have of him. Wanting to be recognized as the world's greater writer, Taketo aims to be at the top of his class.

OP
Ritsu is briefly naked.

Episode 1
Taketo imagines himself at the beach.

Episode 8
Taketo's shirt flies up repeatedly.

Episode 9
Taketo imagines himself naked.

Episode 10
Taketo visits a hot spring.

Episode 12
Taketo appears naked.

OAD
A monster plant attempts to strip Taketo nude, and Ritsu's shirt and pants are unbuttoned in a story that Taketo is narrating.