Kobato and Osanai are invited to Dojima's house, where he makes them cocoa using his special method. When Osanai leaves, Dojima asks Kobato about her change in personality. 
In other words, the fourth wet thing...
...بتعبير آخر، الشّيء المبلّل الرّابع
Das vierte Gefäß war also
En resumen, el cuarto objeto mojado…
En resumen, lo cuarto que mojó…
Le quatrième récipient
qui est resté mouillé,
In pratica, il quarto oggetto usato...
Em outras palavras, a quarta coisa molhada...
Иначе говоря,
последний мокрый предмет —