“Every sky needs its clouds. Every captain needs a ship. And every Lock needs its Key.”

Rokuro Adachi was just an ordinary high school delinquent—until the day everything burned.

When a mysterious invader descends on his world, Rokuro loses everything. Then… he wakes up somewhere else. A new world. Alone. No answers—just a strange prophecy, and a name echoing in his head: the Lock.

Now branded a chosen hero, Rokuro is forced to chase the invader, Draven, across the interconnected worlds of the Realm Ring—a journey filled with danger, lies, and powers he never asked for. With the hope that maybe… he can undo the damage he’s done to his own life.

At his side is his Key: a living weapon, a guide, and the only one who truly understands what he’s becoming.

Together, they’ll battle twisted magic, uncover buried truths, and confront enemies that feel too familiar. Because the deeper Rokuro goes, the more it feels like he’s done all this before.