Eromanga Sensei is a light novel series written by Tsukasa Fushimi and illustrated by Hiro Kanzaki, that received an anime adaptation in 2017.
The story follows Masamune Izumi, a 15-year-old high school student who loves writing light novels and his sister, Sagiri Izumi, a hikikomori who never leaves her room, even to eat, and always relying on her brother to bring food to her room.
Episode 9 EditMasaume is invited to a writing camp on an island owned by Elf.
Episode 10 EditMasamune's robe is slightly loosened.
Episode 12 Edit
Masamune is resisting the girls' attempt to see his privates. Later on he walks out after taking a bath, not realising that Sagiri is outside.