From FairGame (JCafe24):
Umeko was born between German dad and Japanese mom that is a geisha. After her mother is passed away in age of three, she was adopted by my mother's best, and a owner of Umeki inn. She was raised like their real child.

Kuranosuke is a Umeki inn's only son, he was a promising young pianist, but at final of Chopin Competition, due to an accident, he have to gave up on his dream. Now he worked as a part-time music instructor at university, while taking a private lesson.

Two that grows up like a real brother and sister, and reunion with Umeko's dad lead them to marriage. Making a daughter named Momoko, with intracting their customer, Kuranosuke's student and musician friend, spending a day in Umeki inn.