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

One day after getting caught in the rain, Runa hops in the tub for a nice jill-off sesh.
And that’s when something strange happened… Two men, old and young,
pop out of a strange portal and force her to fight some kind of monster!

But the monsters of this world can’t be damaged with normal weapons!
No, they need to be attacked by other means…

As the legendary Succubus Runa, our heroine sets off on a dungeon-crawling journey
to destroy evil and maybe, if she’s lucky, return to her own world.