Succubus Runa and Erotic Dungeon / サキュバス瑠奈とエロダンジョン

Suddenly while returning home The main character (Runa),
who came home soaked in the rain , was in a mysterious space when she took a bath, masturbated, and went to bed.
Upon exiting that space, a mysterious grandfather and a young man are advised to become "magical soldiers" and are
reluctantly forced to fight monsters that they have never fought as a test.
The monsters in this world are completely undamaged by swords and axes, and while there are no modern weapons such as guns
, the only damage in the harsh world where there is no means of attack is the "Ano weapon" ...
Runa changes her name to "Legendary Succubus Luna",
unravels the truth about what is happening in this world, and goes to an erotic dungeon where single monsters move to return to the present age.