Fraw and Kio are angels entrusted with guiding souls to Heaven. Growing up together, Kio was always the one who looked after the more reserved Fraw. Their dynamic shifts dramatically when Fraw receives a sudden promotion to one of the highest classes of angel, becoming Kio's protector instead. The two must navigate this role reversal while battling the Manifis, malevolent spirits that prey on human beings. As they fight, secrets emerge: Kio's wings are unusual, hinting at something deeper about his nature, and Fraw struggles to keep his new position hidden. The story unfolds across a series of battles and missions, gradually revealing the hierarchy of the angelic realm and the true threat the Manifis pose. Alongside the central pair, a cast of supporting angels — including Dean, Lys, Ante, Wei, and others — receive their own subplots, each growing through their interactions and conflicts. While the bond between Kio and Fraw carries undertones of Boys Love, the relationship remains chaste, expressed through protective gestures and heartfelt declarations. Originally conceived as a one-shot called Eden, the narrative expands into a complete saga spanning twenty-eight chapters, blending action, fantasy, and supernatural elements in a world where angels defend humanity from unseen darkness.