pornographic book; erotic book; hentai comic
Casual term for any printed pornographic material, including photo books and comic books (manga). Often used for explicit adult content.
He secretly bought a pornographic book.
部屋の隅にエロ本が積んであった。
There was a stack of erotic books in the corner of the room.
Compound of エロ (ero, 'erotic') and 本 (hon, 'book'). The prefix エロ is a common abbreviation of 'erotic' in Japanese.