This is the OVA version of Bleach. Yup, Tite Kubo has already release 3 OVA version: Memory in the rain, The sealed Sword Frenzy, and Stardust Diamond. I find this manga last year and the story is completely the same with the anime.
The story starts with the crack on a monumental statue. 400 years ago, Baishin, a shinigami was sealed into that statue by some generals. He had surpassed the technique of using zanpakutoh by absorbing the sword to his body. But, this power is out of his control. He killed 63 shinigami and run to the real world.
Now, he’s trying to get more power by sucking Karakura’s people’s soul. What is it for?