This is a fast-travel story covered in interstellar skin (￣ˇ￣)v
It is said that you have to go into the mind of the Crown Prince himself and help him through the plot to recover the mental fragments and wake up painlessly.
--The people who were sent there before have their brains broken. Only you can save the crown prince!
--My brain is not broken, I won't help!
--Don't worry, even though their brains are broken, they can all be cured!
--Yeah, that's something you can consider.
--Yeah, the recovery effect is remarkable, and I can now memorize the multiplication table!
--? ? ?
--Why don't we talk about the benefits?
--Make a deal.