Our Songbird [Diabolik Lovers]

Tsubasa Ishikawa is a beautiful girl who was hospitalized at a very young age. She always smiled no matter what came her way, with her blue eyes as bright as the ocean. She doesn't remember her past, her family, or anyone.
Happiness is brought when a girl named Yui Komori begins to visit her. They instantly become great friends, until Tsubasa is adopted and taken to a loving, prestigious family. They stayed in contact over the years they weren't together.
Tsubusa grows a bit, and decides to visit her best friend again. When she arrives to the Sakimaki Manor, she is surprised to find Yui living on her own with a few males. The Sakamaki brothers, feel somehow how connected to the blonde, which peeks their interest. Tsubasa finds out that, these young men might be able to help her remember her past.