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The Shadow Hero. There once was a man known by that name in a certain other world. His name was Amane Kaito. A junior high school student, he was a transfer from Earth. He fought to protect the world, experiencing countless encounters and partings. Eventually, his achievements were recognized, and he was granted nobility in a country within that other world.

Though he also actively worked as a noble, his strong influence ultimately became his undoing, leading to the division of the country itself. Grieving over this, he entrusted the future to his comrades and decided to return to Earth.

Three years after his return. He had enrolled in a private high school founded by a certain corporation, and even on Earth, he was living as a student while still getting entangled in various incidents.

Then, one day. The sky above his high school tore open, and a deafening roar reverberated. When the light subsided, the sight he beheld was that of the other world he knew. And so, he decided to resume his adventure in that other world, now three hundred years later, this time to bring his entire school, which had been transported along with him, back to Earth.

Additionally, please look forward to the Earth arc, which unfolds concurrently with the main story, and Kaito's prequel from his time on Earth.