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A large man with an easygoing attitude and incredible skill with a sword. He is the human hero who ended the Mekkai Sensou (The War between the Worlds). Miya is the incarnation of his daughter in the World Between, and he comes at her call, intent on saving her. Like Hime, he was once presented with the choice of doors, in his case between ending the war early and losing his wife in the process or saving his wife in exchange for allowing the war to continue until the worlds were exhausted. He made the hard choice of sacrificing his wife and saved the four worlds. However, all he received in exchange was the anti-magic sword, Konjoutou, which negates magic directed at the user in exchange for devouring the world's memories of the user. This is the reason why none of the people at the school remember Gen, and why his daughter and adopted daughter have both forgotten him.