|Nome japonês||浅岡 優一 （あさおか ゆういち）|
|Família||Ken Kaneki's aunt (mother) |
Ken Kaneki's mother (aunt)
Ken Kaneki (cousin)
Ken Kaneki's father (aunt's husband)
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Yuuichi Asaoka (浅岡 優一, Asaoka Yūichi) is Ken Kaneki's cousin. Because he didn't do well at school, his mother had always compared him with Kaneki, or rather, compared himself with Kaneki's mother. He seems to be the type who neglect their studies and spend their time playing video games.