The Tower of Obsidere is a unknown structure that emerged in the middle of the world and reached the heavens. It has multiple floors housing diffrent environments from forest, desert, cold tundra, plains, swamps, and caves. Uses the RPG system fantasy monsters and user chooses classes. Random beautiful girls of various races from horned demons, humans, elves, dwarves, and cute animal ear beastkins. They may be various classes from barbarian, archer, cleric, assasin, paladin, knight, and Samurai.