The Idolmancer Game Over is an ending which occurs when the player loses to the Yurimancer at the end of the Zombie Apocalypse Camping Trip.
Defeated, Eric(a) and Yoshida brace for a final finishing blow from their opponent. Instead, the Mistress of the Lily comments that the two aren't bad at all, and decides to send the spirits of Yue and Mai to possess them. She eplains that the two spirits were rather successful idols when they were alive, and her most loyal supporters. She has been looking for new vessels for them for quite some time, but none seemed up to the challenge until today. While Eric(a) and Yoshida initially resist this, the Mistress seals their souls away inside their own bodies, leaving Yue and Mai with full control. The two spirits immediately begin magically rebuilding their hosts to better suit their roles as idols. As a finishing touch, the Mistress gives them new outfits which she designed herself. The girls are so overjoyed that they strip nude and make out for several hours, before falling asleep in bed together.
Now in full command of their new bodies, Yue and Mai brush up on their performance skills to prepare for their return to stardom. Eric(a) and Yoshida try repeatedly to reclaim their bodies, but fail again and again, gradually growing so weak that the invading spirits claim true ownership of the bodies, rendering the unfortunate fallen heroes nothing but wandering spirits. Over time, Eric(a) comes to feel less hostility toward Yue, and now wishes to support and encourage her, a result of the necromancer's magic shaping the spirit to her will. Eric(a) is content with this knowledge, knowing that their former body is being put to a better use than its former role.
Eventually, Eric(a) is permitted some freedoms and meets up with Yoshida, who has undergone similar rehabilitation. The two of them are both thrilled with their new roles, and once they develop the ability to manifest, they are hired as backup singers and dancers for Yue and Mai. Eric(a) even manages to attract a small cult of cult member fans of her own. By this point, the cult has fully conquered the world and introduced a new civilization of zombies having lots of sapphic sex together. The next step is obvious - to take the idol fever interplanetary! And so, with Yue and Mai spearheading the yuri zombie invasion, Eric(a) and Yoshida now assist the idols in hosting massive concerts and turning every last inhabitant into part of the lesbian undead orgy.