It is the Edo era.

Lust and desire swirls within the "other side" of the luxurious and gorgeous Shin-Yoshiwara. At the long-standing brothel called "Oukaya", the protagonist Chihaya works as its top-ranking oiran (courtesan). In order to go back to her motherland, she enterains male strangers day and night.

Her unchanging everyday life...
Yoshiwara might be a small world, but to Chihaya, it's a treasured place in which she can prove herself. The brothel's owner, Shigure. Her servant, Yuzu. The strong-willed fellow harlots that work alongside her. Surrounded by irreplaceable people, though her line of work is called "the world of suffering", Chihaya is proud of being a courtesan...

...Until she learned what true love is.

This is the story of upheaval in which an oiran gets swallowed by a fate she cannot fight against.

[Translation of the official website story summary.]