In the unending cycle of the 'Great War of Heroes,' a relentless clash between the hero and the demon king in every era unfolds. Unbeknownst to many, the fourth grand conflict witnessed the heroes emerging victorious over the Demon King. Tweight, the exceptional agent operating in the kingdom's shadows, carries out all the clandestine tasks for the nation and aids the Hero in vanquishing the Demon Lord. An unsung hero, Tweight aspires for a tranquil existence post-war. Yet, toppling the Demon Lord only scratches the surface of ushering true peace into the realm. This chronicle follows a timid lad who once toiled 'behind the scenes,' grappling with conflicts, defying odds, and fiercely safeguarding his ordinary life against imminent threats.