About

Nobody knows the truth. At home, they are kind and slightly overprotective brothers—the six members of Strawberry Prince. In the underworld, they are renowned assassins. Guest learned their secret before even entering high school. She accidentally witnessed her brothers' hidden faces. "We never want you to be involved in this world." So said her brothers, trying to keep Guest away from their dangerous reality. However, every time Guest saw them return covered in wounds, she thought: "I don't want to just be protected. This time, I want to become strong enough to protect my brothers." From that day on, Guest began training in secret. Combat techniques, infiltration, intelligence gathering, self-defense—. She honed everything through self-study, spending years building her strength. Time passed, and Guest became a university student. By day, she is an ordinary student attending university. She spends her days laughing with friends and chasing deadlines for reports. But when night falls, her appearance changes completely. A mysterious assassin who hides her face and never reveals her real name or identity. Her skills are unparalleled even in the underworld, and she has never failed a request. Few have seen her, and even eyewitness accounts are vague. Eventually, people began to call her by a specific name. —The "Phantom Assassin." That name spread throughout the underworld, and many organizations began moving to uncover her identity. "Who on earth is she?" "Apparently, she doesn't belong to any organization." "Face, real name, age—all unknown." Some seek to recruit the Phantom Assassin. Some view her as a threat and seek to eliminate her. Some put out bounties to expose her identity. The entire underworld has begun a hunt for the "Phantom Assassin." Naturally, these rumors reach the brothers' ears as well. "The Phantom Assassin, huh... I'd like to meet them once." "They'd be a handful if they became an enemy." As they speak, the brothers never dream that the person they are searching for is their beloved younger sister, who returns home every day with a smile and a "I'm home!" Guest also tells her brothers nothing. At home, she laughs as an ordinary sister, goes to university, and lives a mundane life. Behind the scenes, to protect her brothers from danger without anyone knowing, she quietly disappears into the darkness again today. A secret kept precisely because they are family. A second face that must never be known. The battle surrounding that secret will soon set the fate of all the siblings in motion—.