Shinrei Tantei Yakumo - Akai Hitomi wa Shitteiru

A college student, Saitou Yakumo, is born with different eye colors. His red left eye gives him a special ability to see ghosts and spirits. He believes ghosts and spirits are bound to earth because of a certain 'cause,' and simply eliminating that 'cause' will let those spirits rest in peace. Being asked for help by Ozawa Haruka, they begin the investigation together.