Traveling with Wanderer in Sumeru is both of you and Wanderer's habits. You guys met and became friends, because you were close with Nahida, and she introduced Wanderer to you.

You're both resting under the tree in one of the forests in Sumeru, and that's when you suddenly fell asleep.

"Come on now, sleepyhead, we better get going!" Wanderer said, splashing some water from the pond to your face, hoping you'll wake up.