Shun's younger brother Fuyuki and his girlfriend Mamiya-san kissed.  When Shun finds out, he asks his friends what he should do as Fuyuki's older brother.
Fuyuki ignores his brother and goes on a date with Mamiya.  The gang decides to follow the couple on their date and end up at a karaoke box.
Whenever you get into trouble, 
you hide them under my bed!
Cada vez que te metes en problemas,
Cada vez que tienes problemas,
Sempre que você se mete em encrenca 
você os esconde na minha cama!