Genkai Dungeon no Hanshoku Jijou

Breed monsters and rebuild your dungeon to defeat the oncoming heroes! Egin, the master of the dungeon, has been hunted down by the heroes. To rebuild the dungeon, which now has a 100% chance of reaching the boss room, he and his second-in-command, the virgin unicorn Saille, try to breed monsters, but the dungeon is full of monsters with one or two quirks...