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In this prequel spin-off series, Megumin from the Crimson Demon Clan devotes all of her energy into perfecting Explosion Magic - and nothing else.

Lingalind is a land enclosed by the Wall. The Wall covers, protects, cultivates, and nurtures the land. One day in Edger, a village on the outskirts of Lingalind, a mysterious man named Back Arrow appears.

Morphed into a raccoon beastman, Michiru seeks refuge, and answers, with the aid of wolf beastman Shirou inside the special zone of Anima-City.

In a flooded world, nations form "Azur Lane" to fight "Sirens". Factions "Union", "Royal", "Iron Blood", and "Sakura Empire" wield anthropomorphized warships from a "Wisdom Cube".