Her abilities come from the god of nuclear fusion, Yatagarasu, and were granted to her by Kanako Yasaka in the god's attempt to turn the Hell of Blazing Fires into an energy source for Gensokyo.

Utsuho Reiuji or Okuu is one of Satori 's pets, a Hell Raven who has lived in the underground world since before it was separated from Hell. Her job is to regulate the flames of the Hell of Blazing Fires.

Utsuho Reiuji (also know as Okuu) is a Yatagarasu (Hell Raven) from Touhou Project who can manipulate nuclear fusion, an ability that she got when Kanako Yasaka bestowed great power upon her to help with an industrial revolution project on the Youkai Mountain.

Utsuho Reiuji (also affectionately known as "Okuu") is a Hell Raven with the ability to manipulate nuclear fusion. In Subterranean Animism, She uses her powers for the fitting purpose of conquering the world, - or at least that was her plan until Reimu thwarted her schemes and put her in her place.

Utsuho Reiuji is a Bird-type Master character. Reimu's and Yukari's scenarios: Joins after fighting against her and Wriggle Nightbug in a plot-related fight during the introductory chapter. Byakuren's and Meiling's scenarios: She can be found in the Hell of Blazing Fires in the Second Stratum. She'll joins after a cutscene.

Final boss of Touhou 's Subterranean Animism and later a playable character in Hisoutensoku. Has the power to manipulate nuclear fusion. Her nickname is "Okuu" (おくう), which is based on an alternate reading of the kanji in her name. Utsuho is a hell raven who has absorbed the powers of a yatagarasu.

Utsuho Reiuji is a character from the Touhou Project series who first appeared as an antagonist in Subterranean Animism, before being turned into a redeemed villain by the players. She is one of Satori Komeiji 's pets, and is a Hell Raven who has lived in the underground world since before it was separated from Hell.

Utsuho gathers nuclear energy over time and when enough has been gathered, she releases it, causing an explosion that does damage and stuns. Fallout is also created after the explosion, causing a DoT effect.

Utsuho Reiuji (also known by her nickname of Okuu) is a character from Touhou Project that made her first appearance as the final boss of Subterranean Animism, where she was confronted by the game's protagonists while attempting to annihilate Gensokyo with her …

Upon activation, Utsuho gradually gathers nuclear energy over the course of 10 seconds, as a yellow glow on her sprite intensifies. At the end, she freezes and becomes invulnerable, unleashing her built-up energy in a massive, radiating nuclear explosion that gets wider over time.