A Black Rock Shooter crossover: Yomi dreams to be rid of Dead Master ever since her return home. Unfortunately her Otherself has different plans as she slowly reaffirms her control over her human counterpart, but neither expected to awake in Equestria. In a strange land home to strange beings, two sides of the same coin will have to work together in order to return home... before a blue star destroys all in her path to drag them back guided only by her violent nature and instincts...

and something more unrequited.

on top of all that the language barrier isn't helping either.
OVA-verse.