Magical Taruruto

Ijigawa's Sibling Duty (1x85)

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Ichigawa gets into a fight with his younger brother Takei, and his mother tells him to put up with her because she's his older sister. He tells Mimora that he wants a brother to protect him, and when he eats it, he receives a potato that allows him to become a brother and sister. So Ichigawa feeds Honmaru and makes him his older brother.