Seirou Opera

From official French synopsis:

In the red-light district of Yoshiwara, during the Edo period, Akane is a young orphan from the military nobility. Following the mysterious murder of her parents, she decides to walk into the lion’s den by going to a luxury brothel: the Akebonorô. Her meeting with Sôsuke, a young pawnbroker and a great seducer with a sharp intelligence, will literally shake up her destiny.
In this environment where lust reigns supreme, is this apprentice courtesan getting ready to taste heaven or hell?