At the core of Shinde Inc.’s day-to-day operations, is the Chief Execution Officer (CEO), Kuro Shinde, who looks like an attractive woman in her 20s. Looks can be deceiving. She is not young and her true form isn’t that attractive. For centuries, her kind, the yōkai, have been co-existing with humans. When the night falls, her organisation starts the real business of assassinations. Cold-blooded and ruthless, she is too busy to find romance. Then again, who ever heard of yōkai romances?