Dullahans are demi-humans whose heads are separate from their bodies. Naturally, Tetsuo is intrigued by the unique traits of dullahans, but Kyouko is just as interested in learning more about her own body. Tetsuo has the idea to ask the opinion of someone outside of his own background in biology, so he takes Kyouko to meet Souma, an old college buddy.
Why can't it be observed? 
Was that someone's intention?
لماذا لا يمكن ملاحظته؟
هل كان ذلك مقصودًا من أحد ما؟
Warum kann man es
nicht beobachten?
¿Por qué no puede observarse?
¿Por qué no puede observarse?
Y a-t-il quelqu’un
qui en a décidé ainsi ? Pourquoi ?
Perché non è possibile osservarlo?
Por que não pode ser observado?
 Será a intenção de alguém?
Почему нельзя обнаружить?
По чьей-то воле?