In the near future, a sudden and unexplained sea rise has left much of human civilization underwater. Ikaruga Natsuki, a boy who lost his mother and one of his legs in an accident some years earlier, returns disillusioned from a harsh life in the big city to find his old countryside home half-swallowed by the sea. Left without a family, all he has to his name is the ship and submarine left to him by his oceanologist grandmother, and her debts. His only hope to restore the dreams for the future that he has lost is to take up an opportunity presented to him by the suspicious debt collector Catherine. They set sail to search the sunken ruins of his grandmother's laboratory in order to find a treasure rumor says she left there. But what they find is not riches or jewels; it is a strange girl lying asleep in a coffin at the bottom of the sea, Atri. Atri is a robot, but her appearance and her wealth of emotions would fool anyone into thinking she's a living, breathing human being. In gratitude for being salvaged, she makes a declaration to Natsuki. 
(Source: Crunchyroll)

__Height:__ 157 cm 

[Agency Profile](https://inari-inc.com/talent/yoko-hikasa/) | [Blog](https://ameblo.jp/hikasayoko-official) | [Instagram](https://www.instagram.com/hikasayoko_official/) | [Threads](https://www.threads.net/@hikasayoko_official) | [(Old) Twitter](https://twitter.com/hikasayokoSP)

Co-hosted the popular weekly radio show Odoroki Sentai Momonoki Five (おどろき戦隊モモノキファイブ) with fellow seiyuu [Eriko Nakamura](https://anilist.co/staff/103983) from 2009 to 2017.
She got married to a person from outside the industry in 2015.
On September 5, 2024, she announced that she was starting her own voice talent agency, [i.nari](https://inari-inc.com/), which would also be representing her going forward.

__Non-anime roles:__
- Neve - Goddess of Victory: Nikke (VG)
- Red Hood - Goddess of Victory: Nikke (VG)
- Celia - Tevi (VG)
- Emilie - Genshin Impact (VG)
- Judith Lanster - The Legend of Heroes Series (VG)
- Brigitta Lycaon - Metaphor: ReFantazio (VG)
- Vita - Honkai Impact 3rd (VG)
- Saeki Kazuko - YanOta: The Delinquent and the Otaku (Drama CD)
- Evelyn Chevalier - Zenless Zone Zero (VG)

In the near future, a sudden and unexplained sea rise has left much of human civilization underwater. Ikaruga Natsuki, a boy who lost his mother and his leg in an accident some years earlier, returns disillusioned from a harsh life in the big city to find his old countryside home half-swallowed by the sea. Left without a family, all he has to his name is the ship and submarine left to him by his oceanologist grandmother, and her debts.
 
His only hope to restore the dreams for the future that he has lost is to take up an opportunity presented to him by the suspicious debt collector Catherine. They set sail to search the sunken ruins of his grandmother's laboratory in order to find a treasure rumor says she left there. But what they find is not riches or jewels; it is a strange girl lying asleep in a coffin at the bottom of the sea. Atri.
 
Atri is a robot, but her appearance and her wealth of emotions would fool anyone into thinking she's a living, breathing human being. In gratitude for being salvaged, she makes a declaration to Natsuki: "I want to fulfill my master's final order. Until I do, I'll be your leg!"
 
In a little town slowly being enveloped by the ocean, an unforgettable summer is about to begin for this boy and this mysterious robot girl...
 
(Source: Aniplex.EXE, edited)