Shinigami Desu (Season 1)

A boy named Kowaga Kushiada, just got in Highschool. This so called, "Highschool," is actually a vessel for the most important species of the world.
Shinigami's.
The boy and 5 others must train to be a Grim Reaper/Shinigami, and guess who they are getting teached by? The Undertaker himself! (Black Butler)
Kowaga not only has to deal with Stray Devils, Fallen Angels, and Lost reapers, he has to deal with his mixed-up girlfriend! Not a Yandere, yet not a tsundere...she is basically both!