An Oni figure who initially appears as a demon but is revealed to be a regular person wearing a mask. He is driven from his homeland by nobles and seeks to reclaim it, trying to recruit Jun to his cause before later aiding him.
Jun initially perceives Mizuha as a hostile Oni leader, leading to direct confrontation and escape attempts.
Mizuha and Gen'un represent opposing sides of the war, with Gen'un's forces actively suppressing the Oni.
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