MJ Book Cafe Ikebukuro is a cafe on the fourth floor of the Junkudo bookstore in Ikebukuro, Tokyo, serving coffee, tea, sandwiches and cake. Its signature items are a roll cake with strawberry jam and cream and a coffee float. Payment is made in advance and PayPay is accepted, and on weekends it often operates with a 90-minute limit. Staff voices are loud, which makes it hard to read quietly.