Konno Muramasa, on his way to school, somehow found himself in a mysterious space. It felt as if that space was floating on clouds.

Then, a woman who appeared there told him an outrageous truth: "Konno-kun, unfortunately, you have died." Before he could even comprehend, he was thrust into another world by the individual present there.

In this new world, Muramasa enrolls in Claire Academy, a magic school, guided by the woman from the sea of clouds.

At the academy, Muramasa meets a variety of people. As he lives out his school life, unbeknownst to him, the secrets and darkness hidden within the world gradually begin to stir.

Points scattered across the world begin to connect and converge into one. When the hidden side of history, woven from lies, deceit, and tears, comes to light, the true meaning of his being thrust into this world will be revealed. Furthermore, the truth of magic within this story will also be unveiled.