Hojo Ran, the daughter of a Meiji-era baron, dives into a river to escape her upcoming arranged marriage to Masato Tendo, the son of a powerful but dangerously toxic family. She nearly drowns, but a nameless teen girl who lives alone in the mountains rescues her. This girl, inspired by the mysterious hermit who raised her, dreams of dying to save another person's life. Seeing an opportunity to do just that, she tells the real Ran to flee, and assumes her identity. Masato sees through the ruse almost immediately, but refuses to kill her like she hopes. Instead, he forces her to keep up the ruse so he can manipulate his family more easily.

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