Koji is the father of Ember and Dusk, a member of the Drama Family and the husband of Hattori. During the birthing of Ember and Dusk, soon after his wife abandoned the twins, he followed suit and isolated himself from the conflict. During this time period, his sanity had its time to drain from his body.

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During the Jatrated, his wife, Hattori, encountered him in his state of apathy. She sought his help but he refused. Without thinking the words she says, his wife tells him the only reason she loved him was his generous arm strength, the only reason she married him.