Out Of
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History
Yukio, along with Rin, was conceived during his mother's possession by Satan. Though Satan's powers were expected to be split between them, Yukio's body as a fetus proved too weak to handle the Demonic power, which appeared to be completely transferred to Rin. Nevertheless, Yukio did receive a mashou at birth, causing him to be able to see Demons ever since he could remember.
The twin's mother died at birth, and they were left into the care of Father Shiro Fujimoto. A priest sent to kill the children of Satan-- but instead spared their lives and sealed away Rin's Demonic nature. He took the children as his own sons, and raised them as humans.
Yukio was often bullied by other kids due to his frail and sickly health, yet his elder twin was typically there to save him. This resulted in his brother being injured multiple times, which sparked Yukio's dream of become a doctor. Through his childhood the younger twin often thought of himself as weak and desired to become strong like his elder brother. It was at an age of seven that his adoptive Father, Fujimoto, approached him and asked him if he wanted to become an Exorcist.
Without his brother's knowledge, Yukio secretly trained for years to become an Exorcist in order to protect Rin. Knowing that one day the veil of their happy lives would be removed-- they couldn't hide forever. While both Yukio and Rin are in their first year at True Cross Academy, Yukio is already an Instructor Exorcist who teaches Anti-Demon Pharmacology to Rin's class. This both startles and surprises his older brother.
Yukio holds a certain amount of regret, but realizes the importance of keeping Rin in the dark about himself all those years. -
