Kei Kishimoto is a central character in the anime and manga series Gantz. She is one of the individuals who are transported to the mysterious room with the black orb after her death, where she becomes part of the Gantz game. Kishimoto is depicted as a kind and gentle person, struggling with feelings of inadequacy and self-worth. Throughout the series, she forms a bond with fellow protagonist Kei Kurono, providing emotional support and developing a complex relationship with him. Her character is pivotal in exploring themes of life, death, and human connections.