Hekigan no Sōkishi Feril to Ririka

Hekigan no Sōkishi Feril to Ririka is an adult visual novel about a sadistic demon king with world-conquering ambitions. After destroying the elven tribes who stood in his way, the tyrant prepares to subject the humans to a similar fate. However, two elven knights who survived his attack, twin sisters named Feril and Ririka, hide among the human army to ambush him. After an uphill battle, the demon king succeeds in capturing the sisters, but is damaged and will need lots of high-quality energy to recover. His pride hurt, our protagonist gets revenge on the sisters by turning into a monster and raping them to steal their energy, forcing them to submit to pleasure while their allies try to stage a rescue.

Like most visual novels, the gameplay consists of reading text atop of illustrated backgrounds and periodically making decisions which may affect the direction of the story. The player may also use a map to travel to specific parts of the world throughout the game. The game features voice acting for female characters only.