|Anime debut||Episode 10|
|Manga debut||Chapter 24|
|English Voice||Mike Vance|
Dr. Yui is an older grey haired man, he was seen wearing buisness suits in the meeting about Shimada's autopsy.
He was excited at the prospect of getting a chance to dissect a parasites corpse. He was more than happy to over take the meeting and discuss about his findings.
Dr. Yui is first seen being contacted by phone, from Police Chief Takizawa. He's informed about the current situation involving Hideo, and is excited at the prospect of having a sample to study and says he'll begin heading to their location.