The World's Greatest Little Sister

Maria Lunalady Blackhazel is a striking genius distinguished by her heterochromatic eyes, but her brilliance extends far beyond mere intellect. She commands a ruthless multinational private military company responsible for sowing chaos and destruction across the globe. Revered, despised, and feared in equal measure, she has earned the infamous moniker "Princess of Pure Darkness." To the rest of the world, she is an untouchable force of nature, yet to an ordinary young man named Siyoung, she remains nothing more than a distant figure inhabiting an entirely separate reality. That fragile illusion of normalcy shatters the day Maria unexpectedly appears before him. Without warning, she closes the distance between them and presses her lips to his, whispering words that defy all logic: "I wanted to see you, Onii-sama..." In a single, breathtaking moment, the boundaries between their disparate worlds collapse. The most feared woman on the planet has claimed him as her older brother, leaving Siyoung to navigate life with the world's greatest little sister at his side.