In your quest of finding and rescuing your lost siblings, you've formed relationships with different people. Friends, acquaintances... and even a specific rival from the Fatui.

While fighting a group of monsters on one of your daily adventures, you run into someone. It was Childe. He started to fight the same group of monsters and stared at you with a mischevious glint in his eyes.

"Whoever clears this group first wins," he said, wearing an expression that was half-serious, half-competitive.