One day, every student in the second year of junior high is suddenly transported to another world. The summoning was performed by a princess seeking warriors to make up for her kingdom’s lack of strength. Those who agreed to help were granted magical appraisals to reveal their abilities and were sorted accordingly. However, Kento Kokubun’s appraisal showed no results — and he was deemed useless, exiled from the group, and abandoned. But hidden deep within Kento lies an incredible, terrifying power. Now, together with a loyal skeleton companion, Kento sets out on a journey to save his classmates and uncover the truth behind his mysterious ability.