Age: 24

Height: 177 cm

First appearance: Chapter 56; Season 1, Episode 6

Soon after her first appearance, she has sex with Kurono Kei. This does not appear to be for any particular reason (aside from the fact that he asked and she stated that he was cute), however as Kurono displays his bravery and cunning through the Buddha mission Sei becomes fascinated by him. Before the second half of the mission, she asks Kurono if he will be her boyfriend. When he agrees, she states that she will take him for a ride in her car upon their return.