The three Invaders return to their home prefecture of Hokkaido for a required summer school day. On the bus ride to school, Mone starts talking about Hokkaido's seven folk legends while Chihori shares random facts about space. As Yuina responds to the girls' wacky conversation with her usual comical comebacks, she is overcome with a very strange feeling about the situation.
That's the lost underground 
city of Shambhala!
!إنها المدينة تحت الأرضية المفقودة شامبالا
Das ist doch das magische
unterirdische Königreich Shambhala!
¡Era el mítico reino de Shambhala!
¡Era el mítico reino Shambhala!
Mais oui,
c’est le royaume de Shambhala !
La perduta città sotterranea di Shambhala!
Essa é a cidade subterrânea
perdida de Shambhala!
Этот утерянный подземный город — Шамбала!