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Karelstein Yuriy is the other main character and squire to the Hero Eristia Vitral in the RPG game Another Story of Fallen Maidens: Fallen Hero and the Magic Sword of Truth. He is also her childhood friend from their days at the orphanage they lived in.
At the beginning of the game, Yuriy is a soldier of the Order sent to try to reclaim Lescatie. After being saved from being raped by a Demon, he offers his gratitude and service to Eristia, after she makes it clear she doesn't remember their childhood friendship. Together, they explore some mysterious ruins to look for the powerful artifact "The Magic Sword of Truth" due to rumors of how its power could make any wish come true. Yuriy is kind and submissive, but for much of the story is oblivious to the failing strength of Eristia and her slow, sexual corruption. He often asks her if she needs help, not noticing her gradual usage of lewd words or her fantasies until late in the game.
He is always raped or ravished by Eristia's monstrous forms before being revealed as his companion's daydreams. He himself is never affected by the sexual corruption. Only at the end of the game does he have consensual sex with the fully corrupted, Succubus form of Eristia and tells her his romantic feelings. He is then transformed into an incubus and together, the duo go on to live in Lescatie.