(how this fits into the Kira investigation)

Episode 20 of Season 3, titled concludes the romance arc between Koichi Hirose and the obsessive Yukako Yamagishi. In this episode, Yukako visits a mysterious beauty salon to use supernatural cosmetics to win Koichi's heart permanently. Episode Summary

Moved by their bond, Aya restores Yukako’s original face. Key Character: Yukako Yamagishi