Hired to probe seaside village attacks, mutant monster hunter Geralt unravels an age-old conflict between humans and sea people that threatens war between kingdoms. Aided by allies, he must solve the mystery before hostilities escalate.
During his evening walk Mister Oscar witnesses an assault. He is very surprised to see that it is the work of a genuine harpy. He wants to find out more, which is not without danger.
在提倡“文明开化”的明治维新时代,是人类与妖人(妖怪)共存于世的时代。 为了处理牵涉到妖人的离奇事件,政府设立了专门机关“妖人省”,由人类与妖人双方共同选派代表进行运作。 被选入“妖人省”的7个人是:半人半妖的混血少女西王母桃、薄蛍、鬼灯、雪洞,以及陆军少尉総角、利剱、丸竜。由半妖少女与陆军少尉搭档进行妖怪退治的任务。