Girl in the Box: Please tell me why I was reincarnated as a mimic monster!

This is the story of a girl who died of illness and was reincarnated as a treasure chest monster, and the series of wonderful encounters that follow.
He fell in love with a slime, met the Dragon King, fought with the hero, wrestled with the Demon King, and did all sorts of messy things. He also experienced all the kinds of events that you would encounter in any isekai RPG game.
These wondrous encounters led her to become the Dragon King and transform her back into a young girl. What kind of encounters will she have in the future?