Netherworld arc, Fire Force Wiki

The Netherworld arc is the seventh story arc of the Fire Force manga series. It follows Company 8 going to the Netherworld to confront the White Hoods. In a flashback, a young Shinra is playing with some toys, leaving some unused ones on the ground. Shinra's mother walks by, asking the boy to pick them up and move them out the way, to which he cheekily replies he'll do it later. Bending down on her knees, she whispers in his ear that naughty boys get sent to the Netherworld, to which he jumps up

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Netherworld arc, Fire Force Wiki