The "erotic" talk you are hearing about is just a twitter joke, 'coz taking over another's body is considered inherently erotic. What ZUN actually did tonight is calling Fushigi no Gensokyo/Touhou Genso Wanderer "erotic."
Also some other jokes made by ZUN before: "Touhou is forbidden to anyone below 24." "If I keep saying 'danmaku are erotic' like that, there might be people who want to censor them. So I should write it down clearly: 'all danmaku in this game are 18 years or older.'"
Translation of backstory:
A strange phenomenon called "Perfect Possession" is taking place.
A phenomenon where one is taken over by a completely different person, not only in mind, but also in body.
But worry not: Reimu is already on her way to investigate the cause behind its occurrence.
"The strongest two have joined forces."
"Something bad might be in store for us humans."
"An opponent who cannot be bested by anybody alone?"
Ludicrous rumors are circulating, seemingly out of the fear in human villagers' hearts.
The so-called "Urban Legend Incidents," yet to be resolved, have bestowed unsubstantiatable rumors with a tendency to take on concrete forms.
And this time, the Perfect Possession is obviously yet another Urban Legend Incident.
This story is about those who keep watch on Perfect Possession, those who exploit it, those unwittingly dragged into it, and those working to expose the threat behind it...
Those who have made the error of seeing themselves as the strongest two. This is their bittersweet story.
Information:
- ZUN only decided on the title three days ago
- Continuation of the Occult system
- A standalone game with all ULiL characters plus new characters
- No demo for this Winter Comiket
- Unabara said they also wished to port it to PS4, but this is still undecided