Ookami no Kuchi Wolfsmund

Wolfsmund (狼の口 〜ヴォルフスムント〜, Ōkami no Kuchi: Vorufusumunto) is a seinen manga series written and illustrated by Mitsuhisa Kuji (ja). Published by Enterbrain, it's serialized on Fellows!/harta (ja) magazine since 2009, with eight volumes compiling the chapters released.

Plot
Wolfsmund is a dark historical manga set in the early 14th century of Europe (Switzerland). The story revolves around the eponymous fortress in the St. Gotthard Pass which is ruled by a sadistic tyrant. Basically, each chapter deals with characters who for some reason have to cross the pass and who end up getting interrogated by the mentioned tyrant.