While taking their usual bath, the boys discuss how much Kyotaro is like an old man. The next day, when they go to school, they find themselves exhausted by climbing up the stairs... and learn that they're all becoming old men!
Now, make your pledge with a kiss.
!والآن اقطعوا عهداً بقبلة
Los, der Kuss des Versprechens.
Vamos. Hagan su juramento con un beso.
Vamos. Haced el juramento con un beso.
Prêtez serment par un baiser.
Forza, suggellate il vostro giuramento con un bacio.
Agora, faça sua promessa com um beijo.
Скрепите свою клятву поцелуем.