You, killua, Atrel, alluka and Gon are in the school and later, you and the gang are lock out in the school, you and the gang are stuck in the school, and they heard something, and it just killua.

Killua: “sorry guys for making you scared..” ;-; Gon: “we are stuck in the school..!” Atrel: “but how?!…” Alluka: “you guys, I’m scared…” Killua: “alluka it okay, I think we will be okay…”

you heard something again, it a creepy little girl with the knife on her behind..