Kemono/jingai Bl
An anthology of different stories involving animal spirits or elementals with partial human forms and speech. It's rated as yaoi, but few of the stories are explicit (Naono Bohra's dogs and Umi Touma's falcons). Only the first stories is dark(ish). The rest are mainly cute and heartwarming. Hungry foxes mate with horny bunnies. Catboys enjoy tummy snuggles. It's a series for the furry crowd.
Ki ga Au to Iu Koto wa
Surprise buttsex!
Kami-sama Darling
Satake Aoi, a university student, wakes up rolled in red string, the result of a promise granted by a god whose name I'm not even going to begin to spell out. Thus begins Satake's days as Mr. Popularity, a situation that isn't as much to his liking as he thought it would be when stonkered out of his gourd. Now he's got to pay up by becoming the god's bride.
Koyoi wa Kimi to Chi no Kisu
Vampire clan living in abandoned house. Funny disclaimer on Chapter One, page 11.
Taiyou no Romance*
Demi-immortals battle each other over The Offering, somebody who's genetic wiring is designed to have his heart eaten, extending their life-span and superpowers (calling up ancient gods and demons), while human corporations seeks to exploit them for eternal life. This time, an immortal named Shidou and the offering, Motoki, fall in love with each other and wage their fights and flights together.
Bouzu to Kumo
Two stories about youkai. A spider spirit and a Buddhist priest make their way through the haunted countryside, having sex.... A shark spirit and octopus spirit try to live out of water, not having sex (for awhile.)
Mahoroba Days
Interesting story about a Shangri-La style city run by deer men-spirit-type things. Since they are primarily animals, they are ruled by nature and go into a rutting season. Since they have human capacity for transcendence, though, the male deer-men saw off their horns in a ritual prior to rutting so they don't skewer each other. In this story, el supremo deer commander of getting messages from gods doesn't want to mate with all the usual flora and fauna, but has his sights on his regular human-schmuck-roommate-servant guy, who is turning out to be tsundere. Funny and unusual set-up. Let's see where this goes.
Marry Me?
Aliens with human/animal crossover characteristics and humans meet and decide they like each other enough to marry, so a marriage arrangement company is set up. Starts off cute and gentle and takes a sudden turn into gold-digging in Chapter 2.
Hajimari Wa Sayonara