Okuu

Okuu (お空, おくう) is the nickname of Utsuho Reiuji, a Touhou Project character. "おくう" was used in her first appearance, that being Subterranean Animism. However, in the later release, Double Spoiler, "お空" was also used.

For a while, there was a faction that claimed that "お空" was wrong and "おくう" was correct,

However, the "お空" was accepted in Double Spoiler and is now used as it is today.

For more details refer to the article Utsuho Reiuji.

Touhou　Touhou Project　Subterranean Animism　Utsuho Reiuji

お空 / おくう