Have you ever thought that you have no one to rely on in a situation? Have you been imprisoned but still liked it? Do you think a mere prison can make you stronger?

I'm Ryouichi Saiko, a highschool student, an escapist and soon-to-be escapee.

See how I will use all my strength as I traverse my way out of this prison called a 'dungeon', get stronger as I walk and kill all my classmates, that have their own cheat skills, who bullied me for the past two years.