Kaguya-sama wa Kokurasetai Wikia
Kaguya-sama wa Kokurasetai Wikia
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Gain her trust, and report her every move back to me.

—Oko to Ai Hayasaka, Vol. 19 Chapter 184 (Page 18)

Oko Shinomiya


Japanese 四宮 黄光
Rōmaji Shinomiya Oko
Gender Male
Personal Status
Relationships Gan'an Shinomiya (Father)

Un'yo Shinomiya (Younger Half-Brother)
Kaguya Shinomiya (Younger Half-Sister)
Unnamed Younger Brother
Maki Shijo (2nd Cousin Twice Removed)
Mikado Shijo (2nd Cousin Twice Removed)

Media Debut
Manga Chapter 184 (flashback)

Oko Shinomiya (四宮 黄光 Shinomiya Oko) is a supporting character in the series. He is an older half-brother of Kaguya Shinomiya.


Oko bears little resemblance to Kaguya Shinomiya and only share a few minor similarities with his younger brother Un'yo Shinomiya, such as his dark eyes and angular face. Unlike his two siblings, Oko is completely bald and has wispy facial hair, implying a certain age gap.

In all of his appearances thus far, he has been shown wearing loose-fitting traditional kimonos and robes.


Not much of Oko's personality is known, though one can extrapolate from his past actions that he is extremely calculating and devious, assigning Ai Hayasaka to spy on Kaguya's every move since she was young. He acts coldly towards Kaguya and makes it clear that he holds no familial or sentimental attachment to her. He also acts much the same way to his younger brother.


Approximately 9-10 years before the start of the story, Oko assigns Ai Hayasaka to start spying on Kaguya, reporting her every move as her personal attendant.


  • The name Oko means "yellow" (黄) (o) and "light" (光) (ko).
  • Oko's surname Shinomiya means "four" (四) (shi) and "temple, shrine, palace" (宮) (miya).


  • Oko is the eldest son of the Shinomiya family, and the heir apparent to the Shinomiya Zaibatsu.
  • Oko is the second brother of Kaguya Shinomiya to make a full appearance in the manga.
  • Oko is also the only member of the Shinomiya family who is known to be bald and possess facial hair.
  • While Oko's exact age is unknown, he is implied to be at least in his late 30s to early-mid 40s.


  1. ↑ Chapter 184


v  e
Shinomiya Family
Main Family Gan'an ShinomiyaNayotakeOko ShinomiyaUn'yo ShinomiyaKaguya ShinomiyaKaguya's Sister-in-law
Branch Families Maki ShijoMikado Shijo
Servants Nao HayasakaAi HayasakaYakumo Amano
Other Shijo CorporationShinomiya Zaibatsu