From Esthétique :

Kakinomoto Karin, the daughter of a millionaire, lost her ability to walk in an accident. During her stay at the hospital, she fell in love at first sight with the medical researcher, Okita Teppei! She bought him a house, but only on the condition that that Teppei spend two hours with her every day. Karin, who only wanted Teppei's heart, will one day find out that not only does Teppei already have a fiancée, but he has a frightening split personality... !

In the warring states era, the princess of Echizen Yukiyotani, a luxurous place named the 'Northern Capital', Rokka encounters a ninja named Kohaku. A brilliant warring state romance drawn by a passionate storyteller.

From Anime Monitor:

Yamada’s passionate storytelling is realized through her star character, Reiji, a violin prodigy with a troubled childhood. Reiji turns to music in order to escape his abusive family, and is enrolled in a prestigious music school. There, he meets his mentor Mitsuko whose own dreams of becoming a professional musician were lost due to a tragic injury. Mitsuko’s fun-loving nature and enthusiasm for living comes up against Reiji’s intense, single-minded passion for music. But together they find a common goal in Reiji’s dreams of success. Intense rivalries unfold against the backdrop of the musical world, while Reiji’s turmoil provides heightened emotional drama.