Battle Spirits: 15-shuunen Kinen Short Anime

(Esta sinopse está em inglês. Ajude a comunidade traduzindo!)

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Bashin and Aibou from "Shounen Toppa Bashin" (1st series) meet Rei and Mugen from "Saikyou Ginga Ultimate Zero" (6th series). They challenge each other to a card battle, using the new keiyaku (contract) cards.