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.
We did Chiyo-san's birthday 
surprise a while back.
Hace poco sorprendimos a Chiyo
por su cumpleaños.
Hace poco sorprendimos a Chiyo
por su cumpleaños.
On a fait une fête pour Chiyo,
l’autre jour.
L'abbiamo fatto poco tempo fa
per il compleanno di Chiyo.
Fizemos uma vez como
surpresa pra Chiyo-san.
Тиё мы тоже устраивали сюрприз.