The Descendants of Druids

From publisher blurb:

The Descendents of Druids is a Lovecraft Variant adventure designed and illustrated by Japanese authors and artists set in the exotic faraway (for them) land of Scotland. The authors take a few liberties with classic English literature in creating the setting of this supernatual adventure. The story plot is firmly in the H.P. Lovecraft mythos, but the game system is compatible with the Monsters! Monsters! rules. So, Game Masters if you wish to drive your players mad with eldritch horror, and you are tired of sword and sorecery, this is the adventure for you. Trade that old cutlery for 20th century pistols and silver bullets.