Grandpa is the paternal grandfather of Nanoka Kiba, and he currently lives with her.
Eight years before the present, on the day Nanoka was caught in a collapse accident, Grandpa was in critical condition.
He survived because Byōki manipulated his lifespan, leaving him alive because someone was needed to protect and raise the young Nanoka.
Grandpa now lives only for Nanoka's sake.
When Nanoka is away, he barely moves and usually spends the time sleeping.
He is worried because Nanoka has been gone for several days.
Even so, he does not pressure her or interrogate her about it.
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