A skill useless from the beginning, . Regardless, in order to save a childhood friend who sacrificed her body to protect him, Touru spent twenty-five years developing the skill. Once completed, the skill could completely defy the world's common sense. Touru, the girl, the naughty child they picked up in a back alley, and the old landlord lady join together as companions, setting out on an adventure to become heroes. A man who lived through the depths of despair decided to move forward and widen his horizons.