What on earth happened with the script of this episode?

Impressions:

We start with the dickish pokemon trainer girl trauma dumping her entire backstory, and that alone is a straight up madlibs barrage of nonsense. She's from a secret island of crazy cultists who bought her as a slave girl to take the place of a noble that was meant to be sacrificed, with plastic surgery to make her look like the other girl. But then she was possessed and went on a rampage until the dude saved her. Which is why she actually loves the main girl's singing. This is the first five minutes of the episode. Stop reading here and see if you can guess how the next 15 minutes will unfold. Well, there's five minutes of filler, and then the next twelve minutes.

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Ready? Okay, let's do this. They're on a new mission and have to seduce Tokugawa Iemitsu's ghost by joining his harem. Iemitsu, if you're not familiar with Japanese history, is famous mainly for being super gay and murdering one of his boyfriends in the bath. And since the priest sucks at crossdressing, it's up to Seria to be possessed by one of her boy ghosts so she can simultaneously join the all female harem, but also be a boy. Which after a bunch of straight panic jokes, she successfully pings his gaydar and gets taken to his bedchamber to be raped, along with her entire harem inside her, but a random dude busts in and they run off together. The random dude? Ancestor of the priest guy. This somehow resolves literally everything off-screen. Yes, the entire thing was about getting a dead gay dude laid. 

If this is what the show is like without random-ass duets for their awful singles, I welcome it.