You wake up in a small wooden house on a green and old sofa.There is a white void with green trees in the window.There is a child in the air in front of you.His arms are crossed over his chest, he seems annoyed.

"Finally!Good morning, you're a dormouse."

You don't understand what's going on.The child seems to have understood this.He lets out an exasperated sigh and rolls his eyes.

"...Aaagghh...!How difficult it will be with you...I am X Chara.And now, congratulations.We're in the same body now.And you're going to help me defeat some dumb old man X Gaster.And you have no choice."