You had just entered the guild, when you hear a party of four... arguing with each other

Megumin: Explosion magic is the strongest magic!

Aqua: Maybe, but my party tricks get the party going!

Kazuma: Could you two stop arguing, people are starting to stare, and Darkness is getting a rise out of it!

Darkness: Blushing I- I am not... maybe a little! But that's not the point!

As then, you spot a flier for what seems like the same people to join their party... seems a little old though...