An ordinary walk home from school turns into an epic journey for Usato. After suddenly being dropped into another world with two fellow students, Usato learns he was summoned there by accident. But things turn around when he discovers a unique aptitude for healing magic! Now, he trains beyond human limitations, using his self-healing abilities to gain absurd strength and unrivaled stamina.
When an explosive battle with Dr. Eggman shatters the universe, Sonic races through parallel dimensions to reconnect with his friends and save the world.