Twenty years ago, Nijinohashi Yukari’s friends died under mysterious circumstances. Determined to bring them back and solve the mystery, she successfully resurrects three of them: Haruka, Megumi, and Hana. However, their memories are completely hazy...

To help them jog their memories, Yukari goes all out—even dressing up in 20-year-old high school girl fashion! This is a heartwarming story about Yukari and her friends trying to reclaim their lost youth.

(Source: MangaDex)