On New Year's Eve, the Asabane household finds itself a little busier than usual with cleaning.
While cleaning their room, Yuta accidentally gets water on Yuki's manga.
Yuta and Yuki get into a fight, ending with Yuki leaving the house.
Yuta has trouble understanding the situation until a piece of paper he finds in the edge of his room triggers his memory.
If you hit it too much, 
you'll ruin the futon.
Si las golpeas mucho, lo vas a arruinar.
Si las sacudes mucho, las vas a estropear.
Se você bater demais vai acabar com ele.