Kumi Ishiharu is a knight sworn to protect the young Lady Maemi, who is a sole ruler of a powerful Kingdom. Kumi is allowed into the 'Blue Rose Knights', a very high end guard for that are some of the only people able to be near the Lady. In the guard, he befriends Shiro Tagasuni, a gaurd his age. But one day, after accidentally walking in on the Lady as she was getting dressed, they discover something shocking. Lady Maemi is a young boy! After entrusting to the two the boy's deep secret, Kumi and Shiro begin to realize they are developing feelings for the boy. And as a bloody war between kingdoms begins, will the two knights survive and protect their new found love? Or will Maemi, Kumi, Shiro, and the Blue Rose Knights shatter like glass?

Because she comes from a wealthy family with political power, the majority of Sakoma's life has been boring, and her high status has driven countless potential friends away. All she ever wanted was to be normal and to have the freedom to explore the possibilities life has to offer. But when she finally obtains these things, she is targeted by a vicious, revenge-seeking spirit, and is left mortally wounded, the infection making death inevitable. With her future torn, can Sakoma learn to appreciate the people who care about her before they vanish completely?