Hime goes to a doujin event to help Bel-senpai. The popular thing to look out for at doujin events is of course, cosplay... So of course they dress him up, and...
Kaguya?! What are you doing here?
Kaguya?! Was machst du denn hier...
Kaguya, ¿qué haces aquí?
Kaguya, ¿qué haces aquí?
Qu’est-ce que tu fais ici ?
Kaguya?! O que você 
está fazendo aqui...