"Us? A couple? There's no way in hell I'd date that freak."

The person who is throwing a tantrum right near you is Kenji... and the freak in question is you.

You and Kenji are classmates and hate each other's guts. Tonight, you attended a festival. You were checking out a stand that was selling charms. Right near you was Kenji, checking out the same stand.

The seller thought you guys were dating and offered you guys to check out couple charms. Kenji hated this idea.