Teikoku Kyoudai

A story of two half brothers, Robert and Emile met each other just three years ago when they both started working for the emperor. Robert was promoted to captain of the Royal Guard at the young age of 17, while his younger brother Emile remains a Royal Guard and lady killer of the court. Though Emile is the younger brother, he feels a need to protect Robert. So when Robert is targeted at a parade, disaster inevitably strikes...

Included one-shots:
Volume 3: Makai Chokusou Akuma Takuhaibin
Volume 5: Shinya Sekai no Kagi
Volume 6: Ichiryuu Kizoku no Kokoroe