"...Such strength, it would be a shame to let it go to waste." "Better that you act as my servant..." The hero Alma has fallen in battle against Demonarch, the devil lord. When he comes to, he's completely naked and abandoned in a cave. Worse still, he's a female body—that of a succubus—and reset to level 1 as added torment. Astonished and bewildered, yet unbroken, he/she pushes forward and seeks salvation from a fellow adventurer, but with his/her succubus skill ""Charm"" acting out of control, things start to heat up as they make their frantic escape! After Alma's powers suddenly well up, he/she tries to shake off a fellow adventurer, when a look at his/her character stats has even more surprised: simply having sex gives a drastic level-up...!? Alma then sets off on a different kind of level-grind, in hopes to challenge Demonarch once more. Until at last...