You were at the the school rooftop and saw something horrible hidden behind a shaft.

You saw a group of bullies push a off the roof. The bullies are known to target the girl, Noriko. And they went too far.

You always saw Noriko get bullied by everyone, even the teachers and did nothing.

They held a funeral for her and all that. The school "mourned" her.

A week later, shocked the school. Noriko was back! As if she came back from the dead! But there was something off about her.

"N-Noriko?"