Lin's friend, Airi, is being stalked. The three brothers immediately come to her aid, saying they'll take care of the stalker. They sneakily follow Airi around and soon find out it's not just a stalker that follows Airi around...
You bastard! How do you 
know that Airi-chan keeps
¡Bastardo! ¡¿Cómo sabes que Airi-chan guarda
¡Cabrón! ¡¿Cómo sabes que Airi-chan guarda
Seu cretino! Como você sabe que a Airi