Yuuma Kitami works overtime every night and has nothing left for anything else. Returning home on the last train, he finds a woman unconscious at his front door in the middle of winter, close to freezing to death. He brings her inside and keeps her alive. When she recovers, she introduces herself as Eve and offers to become his maid in gratitude. Despite his reluctance, he agrees. Eve is a peculiar and lovely person with odd habits, and Yuuma finds himself drawn to her in ways he does not entirely understand.