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.
Wait. But if it's living in Lake 
Kussharo, that must mean...
...لحظة. إن كانت تعيش في بحيرة كوشارو فهذا يعني
Huch? Sie kam doch
vom Kussharo-See, oder?
Espera, si vive en el lago Kussharo…
Espera, si vive en el lago Kussharo…
Mais oui,
elle a parlé du lac Kussharo.
Un attimo però.
Se viveva nel lago Kussharo, significa che...
Espere. Mas se está morando no
Lago Kussharo, isso deve significar...
Стоп. Раз оно живёт
в озере Кушаро, значит...