I really wish I had read this before I watched the OVA. Ahhh, regret.

Wait, what?! THERES AN OVA??!!!!!!

Yup, there's one 50 minute OVA. However, it makes the entire story seem way darker than it really is -_-

Wow is good thing I read the comments otherwise I would have miss the OVA. Thanks for the info.

there is book and a series of book and live action movie