Oboreru Kemono no Koibito  

Conflict of Love, 溺れる獣の恋人。

In Kemono series, there are eight volumes. The story revolves around Kazuki, who is the young master of Toudou Group and undergoes training to become the heir as instructed by his father. After 12 years of tutoring and becoming lovers with Chiharu, she becomes insane due to her love for him. She takes matters into her own hands. How far would Chiharu go in expressing her love for Kazuki, and how much could he tolerate from his beast lover?