Well there's this trap for one who is... well, trapped.

He did tried to hide in his room for remainder of the festivities but well, that wasn't for everyone and he had to come out at some point. Chihiro just hadn't expected to be trapped so quickly despite his best efforts to avoid all mistletoe at cost. But alas, there he was; stuck, with no means of getting out...

That is until he saw Yamada walking towards his spot. He called to his classmate, "Yamada!"