Kodai Arima, YU-NO Wiki

Kodai Arima (有馬 広大, Arima Kodai) is the husband of Keiko Arima and the father of Takuya Arima who is dead prior to the series. The name Kodai means "wide, broad, spacious" (広) (ko) and "big, great" (大) (dai). Kodai's surname Arima means "exist" (有) (ari) and "horse" (馬) (ma).

YU-NO: A Girl Who Chants Love at the Bound of this World - Wikipedia

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Ayumi Arima, YU-NO Wiki

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Ayumi Arima

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Kodai Arima, YU-NO Wiki

Ayumi Arima YU-NO: A girl who chants love at the bound of this world.

Kodai Arima, YU-NO Wiki