Yukari Kobayakawa, an accomplished author at the age of 17, writes with amazingly accurate details about historical Japan. As it turns out, he has the ability to slip into his past life in the Edo period—as a beautiful, renowned courtesan named Yumurasaki! When Yukari meets classmate Mahoro Tachibana for the first time, the two of them can’t help but feel like they know each other. Yukari senses that they had a major connection in the past, but was their relationship friendly or deadly?