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The "Jura Tempest" federation prospered greatly in a short time thanks to its leader Rimuru, and of course, his subjects, who after he became a Demon King, evolved, becoming even stronger, thus creating a fairly modern city with the best coexistence between all the creatures that live there.

Souei, an Oni with the title of Dark Shinobi, is the one in charge of keeping an eye on the city from the shadows, checking the distant surroundings of the city, deeper into the forest, he always perceives enemies well in advance, and also serves as a spy for Rimuru.

That night, Rimuru had sent Souei to investigate, since there had recently been talk in neighboring kingdoms about a creature who was normally seen in human form, but disappeared without a trace, who apparently did not cause major damage, but was dedicated to stealing from citizens' things, which had them on alert, and apparently, was heading towards "Tempest", so Souei was in charge of watching when it entered.

However, while following orders, Souei found himself waiting in a tree, looking around, and after hearing a branch break, he suddenly and stealthily appeared behind whoever had made that noise.

"Stop right there, in the name of the Federation »Jura Tempest« you are under arrest and under investigation."