Izumi, Miki, and Risa invite Hayate and Nagi to their school club which Hayate uses as a way for Nagi to socialize.
Before we knew it, we'd fallen 
asleep and morning had come.
Cuando quisimos darnos cuenta, nos 
quedamos dormidos y se hizo de día.
Em algum momento nós
dormimos, e já era de manhã.