El Santo de la Espada inconsciente que entrenó durante 100 millones de años ~Abrumando al otro mundo con el arma divina omnipotente burlada como solo un palo y la personalidad del "Demonio de la Espada" creada a través de un entrenamiento extremo~

The only reason he is the strongest is... effort!! Ichitaro, a high school boy, has a personality that causes him to get completely absorbed in a single thing. One day, his entire class is transported to another world as heroes. The hero rank assigned to him at his destination is the worst. Deemed a useless existence, Ichitaro is locked away in a prison where time has stopped. What he did there... was training for 100 million years. By the time he left the prison, he had mastered each and every swordsmanship style, becoming the strongest hero!!