• Book Name: Mairimashita! Iruma-Kun Mafia Au Manga
• Alternative(s): Welcome to Demon School! Iruma-kun (Mafia Alternate Universe) ; 魔入りました！入間くん if Episode of 魔フィア ; Welcome to Demon School! Iruma-kun: If Episode of Mafia ; Mairimashita! Iruma-kun: If Episode of Mafia
• Genre(s): Action Comedy Shounen Slice Of Life
• Author(s): Hiroja
• Status: Ongoing Download Manga
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Summary: The beloved characters of Mairimashita! Iruma-kun star in this Mafia-based spinoff! Young Iruma saves an injured mob boss from death... and then becomes his grandson!?