Sekine invites Chiyo to a sleepover at her house, and the other two invite themselves as well. They deepen their bond while Rikka learns more about the quirky cultural activities that take place on Earth.
I can't take off my glasses 
for some specific reasons.
Die Sache ist, ich kann aus bestimmten
Gründen meine Brille nicht abnehmen.
No puedo quitarme los lentes
por motivos concretos.
No puedo quitarme las gafas
por motivos concretos.
Une raison m’empêche
d’enlever mes lunettes.
Non posso togliermi gli occhiali 
per motivi precisi.
Na verdade, eu tenho um motivo
pra não tirar os óculos.
Я не просто так всегда в очках.