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...
Plus, then you'll be able to tell 
that I'm Airi's brother, Rei.
De hecho, deberían saber que 
soy el hermano de Airi, Rei.
De hecho, deberíais saber que 
soy el hermano de Airi, Rei.
Mas é verdade, sou Rei, irmão da Airi!