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.
As his brother, I'm relieved.
Como su hermano, me siento aliviado.
Como su hermano, me siento aliviado.
Como irmão, fico aliviado.