A scan of the latest edition of Young King OURs magazine revealed that an anime adaptation of Drifters is in production. The type of anime is still unknown.

The action fantasy series is written and illustrated by Kouta Hirano, the author behind Hellsing. It began serialization in seinen magazine Young King OURs in April 2009. The manga was nominated for the Manga Taishou award twice, once in 2011 and again in 2012.

Synopsis
Shimazu Toyohisa, whilst involved at the Battle of Sekigahara, manages to mortally wound Ii Naomasa, but is critically wounded in the process. As he walks from the field broken and bleeding, Toyohisa finds himself transported to a corridor of doors where a bespectacled man at a desk waits for him. This man, Murasaki, sends Toyohisa into the nearest door where he wakes up in another world. There, Toyohisa meets other great warriors like him who have been transported as well, to be part of a group known as "Drifters." (Source: Wikipedia)

A teaser trailer for the series was included in the final volume of Hellsing Ultimate in late 2012. Approximately 4 minutes long, it cast Yuuichi Nakamura as Toyohisa Shimazu and Mitsuru Miyamoto as Murasaki.

The fourth compiled volume of Drifters was released in October 2014 and it topped Oricon's weekly manga rankings chart. Dark Horse Comics has licensed the manga for release in North America, and three volumes are currently available.

Source: Nekonotemo

Drifters on MAL