Mairimashita! Iruma-kun: Boku Doumei no Game-michiMairimashita! Iruma-kun - Boku Doumei no Game-michi; 魔入りました！入間くん　僕同盟のゲーム道

A spin-off manga featuring Iruma Suzuki, Shax Lead, and Soi Purson - the three of which make up the titular "Boku Alliance" - as they play various Netherworld video games.