One day in a certain private school with dormitories the whole school was transported into another world. I Kaya Kazuhisa from the 1st Grade of the High School Section had been bullied for long periods of time. To kill the culprit who had bullied me I dug a trap but unexpectedly I killed a monster. From that moment I evolved into a rare existence that can go against the monsters. At the same day I saved a girl from Middle School Section 3rd Grade Shimozono Arisu in the forest from an Orc. When I was working with Arisu to defeat the Orcs and gradually leveled up I was forced to make a choice: Should I choose the Summon Magic which is suitable for surviving alone? Or should I choose Support Magic which is used when battling together with others?