Sirius the Jaeger is an anime series that I picked up on a whim. The series had some really fascinating concepts going for it, but it would’ve been so much stronger with a handful of improvements in some key areas.
Mermaid Saga by Rumiko Takahashi is a shōnen, fantasy horror manga series that follows a young man who ate the flesh of a mermaid and became one of the super rare individuals to obtain immortality. After 500 years of living, he sets out on a quest to discover how to end said immortality.
Kemono Jihen (怪物事変) is a shōnen, dark fantasy, supernatural anime adaptation of the manga series, following Special Detective Kōachi Inugami who’s summoned to a mountain village after the discovery of animal corpses. Shortly after he arrives, he meets a young boy that wishes to help the detective in solving the case. This eventually leads Inugami to realise that supernatural forces may be at play.