Novelist Aika could see ayakashi since he was a child and due to people treating him like a weirdo, he became a shut in and started to dislike people. His only friends were his dog and the ayakashi around him. One day he meets an ayakashi, Rintarou, who looks like his childhood dog but this ayakashi is capable of taking human form.
The earth God receives a human sacrifice "bride" every 100 years when the door between his world and the human world opens. However, it is the first time that he received a male bride.
In this world, humans have intermixed with beasts (called bob) which lead to various new genders. Haruka,17, father decided to remarry a rich bob that has lycan blood running through his veins who also has three sons (vampire, siren and a lycan) who will become haruka's step brothers.
A wanted beast man breaks into a erotic novelists house but the novelist does not really mind the beast in his house or hiding him from the authorities.
Kaede is from the rabbit clan who are having problems with their harvest and will run out of food. The wolf tribe agreed to supply the rabbit clan with enough food for two years but they want Kaede as a bride for the eldest son.
Gakkou No Sensei