Book and Bed is an incredibly cool hostel in Ikebukuro area focused on books. They even call themselves an “accommodation bookshop” though no books are actually sold. Instead a room you will book a bunk bed and use the shared bathroom and toilets. This is one of the many new options of cheap accommodation popping up in Japan because of the tourist boom in the country. If you are just curious, you can book a day use.
Book and Bed