Yuuki Kouichirou

Asuna's older brother. He has been working at "RECT" since before the SAO incident occurred. In the original work, he is only mentioned by name, and he makes his first appearance in the movie 'Progressive: Aria of a Starless Night.'

The NerveGear and SAO package that led to Asuna being trapped in SAO were originally purchased by him for his own play, but due to a long-term business trip scheduled from the first day of the official service launch, he left the NerveGear in his room, which ultimately changed Asuna's fate.

He views Kazuto, his sister's boyfriend, favorably and has deepened their relationship without Asuna's knowledge, having Kazuto call him "Kouichirou-kun."