Based on the adult game by Astronauts: Sirius. 
 
There once was a maou Astaroth who invaded the human kingdom, plunging the world into war. However, he was finally suppressed by a group of heroes who took his powers and sealed him deep underground. Two hundred years later, there were rumours that the seal was broken due to the recent shifts in the Earth’s crust and that the maou had been revived. Many confident adventurers descended on Astaroth’s underground labyrinth with the intention of defeating him and becoming famous. Little did they know that he had set out a trap for them… 
 
(Source: Hau~ Omochikaeri!)

Based on the adult game by Astronauts: Sirius. 
 
The nomadic people founded four countries on the once barren Nilt region. They were the Elven kingdom of Lusario, the Eastern empire Shuka, the ice empire Kilos and the dark demon kingdom of Hados. However, Hados collapsed due to an instigated revolt by the humans. One hundred years later, the Diabolica were viewed as bringers of destruction and chaos, and as such, they were a target of discrimination and suppression. 
 
Caym was a Diabolica prince who survived the fall of Hados in a remote place. A girl named Risbell visited him and pleaded for him to revive Hados to save the Diabolica, and to avenge the deaths of her parents by human hands. He proclaimed that he would defeat the three countries and make their respective queens his servants. 
 
(Source: Hau~ Omochikaeri!)

Based on the adult game by Astronauts: Sirius.

Based on the adult game by Astronauts: Sirius. 
 
A demon of the Astaroth invaded the human kingdom, dragging the world into war. However, he is ultimately repressed by the unity of the hero who takes his power and seals him deep underground. Two hundred years later, there are rumors that the seal is broken because the latest in the earth's crust and his demons have been revived. Many confident adventurers descend on Astaroth's underground labyrinth with the intention of defeating him and becoming famous. Little did they know that Astaroth had made a trap for them ... 
 
(Source: Nekopoi and Has Been Translated)

Based on the erotic game by Astronauts: Sirius. 
 
It has been a year since the tyrannical Demon King was defeated by the six heroes of the kingdom. One of the heroes, King Golten, persecuted and oppressed the demons. Meanwhile, the Demon King's daughter Lapis visits the "jack-of-all-trades" Shigure with her maid, Kalmia, in order to rebuild her ruined castle. The reward is a beautiful woman's body. Thus, the man with the power of charm becomes the strategist of his master and servant, and begins his work to revive the demon tribe!! 
 
(Source: parabook, translated) 
 
Note: Includes 1 extra chapter from the e-book limited special extended edition

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