A pair of sirens discover a door to Nekoya while scoping out Chimera Killer Island for a new nest, but the two birdbrains could cause trouble...
On every seventh day...
...في كلّ يوم سابع
An jedem siebten Tag …
Cada siete días…
Cada siete días…
Tous les sept jours.
Una volta ogni sette giorni...
A cada sete dias...
Каждые семь дней…