Introduction: Haruto Watanabe never expected to open his eyes in a world called Suisei鈥攎uch less one where he鈥檚 invisible, untouchable, and guided by a cheeky talking tsubame. Yet the moment he drifts through Onikawa鈥檚 towering fortress, watching horned Oni lords prepare for a lavish festival, his ordinary life is left behind. Amidst alabaster halls inlaid with gleaming jewels, the Oni鈥檚 ancient rituals collide with a new threat: the emissary of King Goritsu XI arrives demanding fealty, igniting a clash of pride and power.In an instant, Haruto is thrust into the swirling drama of Oni politics, arcane war-systems, and heroic levels. As the Oni lords J奴s艒, Homura, and Kinryu vow to defend their land鈥攅ven challenging the majesty of Majokawa鈥檚 fleet鈥擧aruto realizes that his ghostly presence may be the key to unraveling Suisei鈥檚 secrets. Swords gleam, alliances tremble, and the promise of war looms on the horizon.  An epic isekai adventure, where destiny, hidden abilities, and a world governed by RPG-like rules beckon a newcomer to rise鈥攐r fall鈥攊n the shadow of looming battle....