|Location||Shinjuku Ward, Tokyo, Japan|
|Japanese Voice||Mie Sonozaki (園崎 未恵)|
|English Voice||Cynthia Cranz|
- Youko is an old college friend of Kouki Maeno's.
- Youko calls Kouki in Episode Three to tell him about his friend Todoroki, an ornothologist, and his disappearance. When Kouki goes to her home for some investigating, she is not able to give him any information other than the fact that Todoroki left a week ago and never returned. After he went missing, she found a card on his table that had a mysterious eye design, a symbol that reappears throughout the episode.