The 24th episode of 'Dark Gathering' begins with a tension-filled opening: Yayoi rescues Yoko from the teacher spirit, an eerie presence haunting the school. Through Yoko's accounts of Daisuke's encounter with the spirit, Yayoi realizes they have become part of a mysterious hide-and-seek game orchestrated by the teacher spirit itself.

Determined to outwit the spirit, Yayoi and Yoko roam the school's corridors. Their path leads them to the place where the teacher spirit met its demise. There, they stumble upon a chilling scene: strands of hair arranged with photos of the students. Yoko's picture triggers an inexplicable reaction in her—she reaches for it and vanishes without a trace.

Next, they discover a locked room holding the core of the mystery: a massive, brain-like structure. Yayoi identifies it as the teacher's spirit. In a decisive act, one of her graduates devours the brain, causing the spirit to lose its power. Yayoi, showing mercy, allows the spirit to depart peacefully.

The episode takes an unexpected turn when police and medical personnel arrive. They were summoned by Dorothy to treat Daisuke and the other affected individuals. Some awaken from the spirit's influence, while others, like Daisuke, suffer lasting damage. This development leads to the temporary closure of the school and attracts worldwide attention.

An revealing conversation between Yayoi and Dorothy uncovers Dorothy's involvement in the creation of the teacher spirit. Dorothy admits she wanted to test Yayoi's abilities and is surprised by her victory.