A car accident not only destroyed Gary's family, but also made him a cripple who could only be paralyzed in bed for the rest of his life. A hospital research project forced him to come into contact with a holographic game - The Last Key. It was originally just to distract him from boredom, but in the end he couldn't help but become obsessed with the feeling of being able to run and jump freely in the game...
PS is actually just an inspirational (?) Story describing the protagonist's transformation from a yandere to a tsundere.