It's Blue Exorcist, but Yukio actually loves his brother and does his best to protect him like he meant to when he first decided to become an Exorcist. Rin is still big brother, but big brother has been mistreated and lonely for far too long. Yukio does his best to help Rin through his world being turned upside down and inside out, despite being busy as a regular student in advanced classes, a teacher, and an Exorcist.