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.
I see you've come here 
to have some fun, too.
Veo que también viniste aquí a divertirte.
Veo que también viniste aquí a divertirte.
Então vocês também 
vieram aqui se divertir.