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.
But, Fuyuki, you're always looking 
at dirty magazines and videos!
Pero Fuyuki, ¡tú siempre viendo revistas y videos sucios!
Pero Fuyuki, ¡tú siempre estás viendo revistas y videos guarros!
Mas, Fuyuki, você sempre vê 
revistas e vídeos eróticos!