A new student, the Antarctican Quetzalcoatl Sassassul, suddenly transfers into the girls' school one day, much to the intrigue of everyone in the class. But for some reason, Himeno seems to have experienced some sort of childhood trauma involving Antarcticans. The new student is as kind and friendly as can be, but Himeno just can't shake her fear...

Meanwhile, everyone in the class has lots of questions for Sassassul...
And we don't have expanding rib cages,
،ولا نملك أقفاصًا صدريّة متوسّعة
Wir besitzen die nötigen
flexiblen Rippen nicht.
Y nuestro cuerpo no se expande,
así que no podemos tragar nada entero.
Y nuestro cuerpo no se expande,
así que no podemos tragar nada entero.
Et nos côtes ne s’écartent pas,
on ne peut pas vous avaler tout rond.
E la nostra cassa toracica non si espande,
Nossa caixa torácica não se expande, 
então não podemos engolir coisas inteiras.
И рёбра у нас не раздвигаются, 
поэтому нам