After coming home from her black company—one that exploits its employees—an office lady makes a desperate attempt to escape her grueling working conditions by summoning a demon, hoping that it could destroy her workplace. But while she succeeds in her endeavor, the demon that emerges is completely different from her expectations! The invoked young boy immediately asks the office lady for her wish. However, her exhaustion and despair lead her to simply request a tasty meal. With a pure smile on his face, the demon—whom the woman later names Kuroha—begins taking care of the chores around her home. No matter how hard life at a black company may be, being looked after by the innocent Kuroha always heals the tired office lady, becoming the light in her draining life. [Written by MAL Rewrite]