Kusa-kai ni nemuru oujo no abadoun / Abaddon, princess sleeping in a rotten world

Hentai "Kusa-kai ni nemuru oujo no abadoun / Abaddon, the Princess Sleeping in a Rotten World" will be based on the original visual novel Fukai ni Nemuru Oujo no Abaddon. This will be the debut work of the studio Sakura Purin Animation. 

In a dark forest stands a lonely mansion. One day, a certain Shokei Yamanobe arrives there with assistants. He is a university professor and a good friend of the mansion's owner. He immediately understands that something is wrong with the mansion - it hides terrible and inexplicable things... Soon the professor disappears without a trace. After a while, Yamanobe-san's son, Homura-kun, also heads there, deciding with friends to find his father. @Anitokyo