The story of Killer 7 follows Haruka Sawamura, a young girl who is determined to take down her mother's killer. After her family is murdered by a group known as "The Red Flowers", Haruka sets out on a quest for revenge, using her unique abilities and skills to track down the perpetrators. Along the way, she must confront the dark secrets of her own past and face off against some of the most sinister enemies in the game.
The gameplay of Killer 7 is fast-paced and action-packed, with a focus on exploration and combat. Players control Haruka as she navigates through levels set in various locations, from creepy mansions to dystopian cities. The game features a variety of weapons and abilities, including a unique "gun" that can be used to solve puzzles and defeat enemies.