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.
One of those things is the 
secret of dullahans,
،إحدى تلك الأمور هو سرّ الدّولاهان
Eines dieser Dinge ist das
Geheimnis der Dullahans.
Una es el secreto de los dullahan,
Una es el secreto de los dullahan,
Le pouvoir des dullahan en fait partie.
Je veux en savoir plus.
Una di queste è il segreto delle dullahan.
Uma dessas coisas esconde
 o segredo das dullahans.
Например, секрет дуллаханов,