Hero x Devil / Eiyuu x Maou
Year of production: 2005.
Genre: VN, RPG, Rape, Oral sex, Fantasy, Demons
Censorship: Is in game (games) of distribution
Developer: Escu:de
Platform: PC/Windows
Edition type: Original (license)
Tablet: It isn't required
Language: Japanese
Translation type: The text and a sound in this language (original)
Interface language: Japanese
System requirements: OS:Win98/Me/2000/XP/Vista, CPU: 700MHz, RAM: 128/256MB
Description
You are Felser, lord of the demons. For a long time, your race lived in peace with the humans. One day, your seneschal Galef announced you the dire news: Humans have started to attack your lands!
While fighting them, you learned that the humans decided to eradicate your race just because they saw it as a threat. Amused by that, you decided that if that is how they see you, you should as well just go back to your old ways and conquer them all!
Some screenshots don't increase, hasn't found others.
Look on the official site of developers.