: The only person who remembers Aoi and the driving force behind the rescue.

: Upon entering, they receive a phone call from a woman claiming to be " Misaki ".

Hanako explains that Aoi has likely been "spirited away" into a —a space between the living world and the spirit world. He identifies the culprit as The Misaki Stairs (the Second of the Seven Wonders), a staircase in front of the art room where anyone who steps on the fourth step is dragged into another world. 🏛️ Entering the Boundary

: The leader of the Seven Wonders who reveals the truth about Boundaries.

The Misaki Stairs represent the school's , governed by an entity named Yako . While the rumor says she shreds her victims, her true motivation is rooted in her tragic past and her obsession with a teacher named Misaki who once showed her kindness. If you'd like to dive deeper into this arc, I can: Summarize Part 2 to see how the mystery concludes.