Sailor Leviathan fought demons every day to protect the town's safety. When the battle ended, an old man living nearby witnessed the moment she reverted from her transformed state. Having discovered her true identity, the old man demanded she help clean his house in exchange for keeping her secret. Gentle and unable to refuse, Sailor Leviathan agreed. However, the old man took advantage of her kindness, gradually escalating his demands. Ultimately, this led to an unexpected turn of events and a tragic ending.