Migi and Dali have been fully accepted as members of the Sonoyama family.
They behave just like real parent and child, but the twins notice that Mom and Dad are acting somewhat distant.
Suspecting that the Sonoyama couple might be hiding something, the two discreetly begin to search the house and stumble upon an unexpected secret of the couple.

Migi and Dali are shocked, wondering if they have been deceived. However, determined not to let things end this way, they execute a plan to retaliate against the Sonoyamas.
The two of us will live as one
نحن الاثنان سنعيش كشخص واحد
Wir leben zu zweit
als eine Person in diesem Haus.
Viviremos en esta casa como uno solo.
Viviremos en esta casa como uno solo.
On vit dans cette maison
tous les deux comme un seul garçon.
In questa casa, noi due viviamo
 come una persona sola, ovvero Hitori.
Somos dois,
mas vivemos como um nesta casa.
Мы оба живём в этом доме
под маской одного человека.