In an alternative feudal Japan, a strange disease that only affects males caused a massive population reduction, leaving females to fill the vacant jobs, therefore changing the social structure. Now, 80 years after the initial outbreak with a 1:4 male:female ratio, Japan is a completely matriarchal society. Females hold all important political positions, and males are their consorts. Only the most powerful female–head of Tokugawa shogunate–may keep a harem of handsome and unproductive males, known as "Oooku."
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- Won the Japan Media Arts Festival Excellence Prize in 2006
- Won a Special Prize at The Japanese Association of Feminist Science Fiction and Fantasy's 5th annual Sense of Gender Awards in 2005
- Won the Osamu Tezuka Cultural Award Grand Prize in 2009
- Won the 56th Shogakukan Manga Award for Shojo in 2011
- Won the 42nd Japan SF Taisho Award Grand Prize in 2022
