Akashic Records of Bastard Magic Instructor x KonoSuba: God's Blessing on This Wonderful World! Special Collaboration Book (Light Novel)
Alt title: Roku de Nashi Majutsu Koushi to Akashic Records x Kono Subarashii Sekai ni Shukufuku wo! Special Collaboration Book (Light Novel)
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A special crossover book released to commemorate the 30th anniversary of Fantasia Bunko and Dragon Magazine. It was released as the bonus book for Dragon Magazine May 2018 issue as compilation volume of total 64 pages.