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...
Right. Some years ago, 
maybe five years ago...
Sí. Hace unos años, quizás cinco años...
Sí. Hace unos años, quizás cinco años...
Bem, há uns cinco anos, ou foi ano passado?