After toiling away as a disillusioned office worker for three years post-graduation, Natori Midori's mundane existence takes a surreal turn when she is unceremoniously let go from her temporary position. Adrift in uncertainty about her professional future, she is unexpectedly whisked away into the universe of a visual novel game she had been immersed in. Here, she encounters the chilling antagonist, Lapis Tenebrae, a character notorious for her betrayal and malevolent deeds in the game's narrative.