Kotori grew up alongside Shin, though he's never made it easy for her. Despite his constant resistance to her help, she's stuck by him—the kind of childhood friend who doesn't give up even when they should probably take the hint.
Things get complicated when parallel world attacks start targeting her specifically. Turns out her other-self in an alternate dimension is a brutal ruler, which makes Kotori a liability in ways neither of them expected. It's the sort of problem that can't be solved with persistence alone.
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