Keiko Arima, YU-NO Wiki

Keiko Arima (有馬 恵子, Arima Keiko) is the wife of Kodai Arima and the biological mother of Takuya Arima. The name Keiko means "favor, benefit" (恵) (kei) and "child" (子) (ko). Keiko's surname Arima means "exist" (有) (ari) and "horse" (馬) (ma). Keiko makes only one in person appearance in the series outside of the final episode. She briefly appears when Takuya is trapped in the cave together with Mio.

Amanda (YU-NO) The Infinite Zenith

Kono Yo no Hate de Koi wo Utau Shoujo Yu-no

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

Keiko Arima, YU-NO Wiki

Keiko Arima, YU-NO Wiki

YU-NO / Characters - TV Tropes

Takuya Arima

Keiko Arima

Keiko Arima, YU-NO Wiki

Keiko Arima, YU-NO Wiki

Yu-no, YU-NO Wiki

Time Traveler's Diary

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