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.
But I don't know what 
the mysteries could be.
.لكني لا أعلم ما قد تكون هذه الألغاز
Aber ich kenne die Mysterien nicht.
Pero no sé cuáles son
las siete maravillas.
Pero no sé cuáles son
las siete maravillas.
Mais je les connais même pas, moi.
Però... non so quali possano essere, questi misteri...
Mas não sei quais poderiam ser os mistérios.
Только я ведь не знаю, что за легенды...