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.
Not to mention, if we knew 
the secret of dullahans,
،هذا دون أن نذكر أنّه إن عرفنا سرّ الدّولاهان
Und falls wir das Geheimnis
der Dullahans ergründen, …
Además, entendiendo
el secreto de los dullahan,
Además, si sabemos
el secreto de los dullahan,
En plus, si on découvrait
le secret des dullahan,
Inoltre, scoprendo il segreto delle dullahan,
Se descobrirmos 
o segredo das dullahans,
Кроме того, если раскрыть секрет
дуллаханов,