Haruka Hitachiin. A fifteen year old boy with a secret. Apparently, he is actually a she but her mother refuses to have a female in the family as she thinks it's disgraceful. So, Haruka changes her apparence completely to match her mother's liking at a young age. Being the only girl sibling dosn't really help either. Her mother wants nothing to do with her but she wants Hikaru and Kaoru to be safe. So, she hires someone to train Haruka relentlessly so that she'll be their perfect bodyguard. One day, things go completely out of hand that Haruka has to decide- will she really get bound by her hidden chains?
[I'm sorry I can't write a good description so if you want to know what this story is about, why not read it for yourself!]