|This article is about a/an Dopant identity in Kamen Rider W.|
- Height: 189cm
- Weight: 87kg
With the powers of the Yesterday Dopant (イエスタデイ・ドーパント Iesutadei Dōpanto), the user is able to force anyone to repeat their actions from the previous day, before the target becomes comatose. Unlike other Dopants, Yukie was not driven insane by the Gaia Memory's influence, which allowed her to choreograph her attacks to suit her needs.
- Main article: Yukie Sudo
The main user of the Yesterday Memory was Yukie Sudo (須藤 雪絵 Sudō Yukie), the younger sister of Kirihiko Sudo. She came to Futo to take revenge against Saeko Sonozaki for her brother's death. After attacking several landsharks attempting to buy the kindergarten she and Kirihiko attended, she approaches the Narumi Detective Agency as Yuko Fuwa (不破 夕子 Fuwa Yūko, resembling the English phrase "Who are you?") looking for her lost cat Kinou (きのう Kinō, literally meaning "Yesterday"). Shotaro takes on the case, allowing Yukie to manipulate his actions as Kamen Rider Double to attack Saeko the following day, but Accel saves her at the last minute. Yukie's identity is revealed, and she states that the attack is actually an audition to join the Museum. When she gets close enough to Saeko to exact her revenge, her powers are turned back to her due to Shinkuro Isaka's modifications of the Taboo Memory for such an attack. She is saved after Double CycloneJoker Xtreme's Prism Break destroys the Yesterday Memory, but its side effects finally manifest in total amnesia.