Youhei Masuzaki
About
He is one of the surgeons who performed a multiple organ transplant on Kirito, he used to be with the Togane Foundation until he left seemly disenchanted with the foundation's inhumane experiments. He later on becomes on of Kirito's accomplice.
(Source: Anime+)
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Misako later on had her son Sakuya kill him because of his knowledge about Kirito's past.
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