Helena Ravenclaw: So...you are just like me?
Youmu Konpaku: No, I'm only half-ghost.
Helena Ravenclaw: How does that work?
Yomu Konpaku: Well, Nitori built a device she called a "Ghost Portal", a portal that would let her enter Purgatory and see the souls of people who have neither entered Heaven nor entered Hell. When I thought she was away, I entered the Ghost Portal when it was off to see what it looked like from the inside. But Nitori entered the lab and turned it on. This caused a freak accident, merging my DNA with ectoplasm, the stuff souls are made of, thus turning me into a half-human half-ghost hybrid.
Helena Ravenclaw: Wow...Muggle technology never ceases to amaze me.