I can't really sum it up, just know it's complicated stuff involving money, weird figts, conspiracy theories, there's also a bit of slice of life.
We don't know much about the characters yet, there's the main guy who seems pretty generic, the kind who thinks he's better off if he ignores everyone around him who just wants a normal life.
The girl he's probably in love with who helps him but sadly already has a boyfriend she probably don't love.
Then come the characters of the other "world", a bit weird, all of them, and the most normal of them all is a bit creepy, he wants somethingbut we don't know what, I hope we'll see him again he's my favourite (which means we probably won't see him)
And last but not least the real creepy guy, the one who seems to be in charge of organizing everything, this show's very own Mephisto, except more creepy.
There's no one I dislike, they all have their secrets and hidden motivations, even the main (well obviously, he wouldn't have been dragged in this otherwise)
Didn't like the OP nor the ED, as usual.
Music is by Iwasaki Taku so wonderful as usual, just probably not the one I would have chosen but it works anyway.
Seiyuu are nice, there's Sakurai Takahiro as the real creepy guy, he does well and his voice changes a lot, it's very enjoyable to hear all the changes in his tone.
Then there's the guy who voiced Natsuno in Shiki, Soul in Soul Eater and the main guy in Gundam UC but I never remember his name, one day I will though and last but not least of the ones I remember there's the guy who voiced Genkishi in KHR, no one cares but I liked him a lot so I'm happy he finally gets more roles.
(Un)fortunately I'll be very biased because this happens to be my favourite anime of the season.
So yeah, I just love it, if you ask me everything is perfect and thus this is a totally useless opinion.
I just hope it'll stay that way because usually when I fangirl so much over a first episode the rest ends up to be bad. Well at least it'll continue being interesting since nothing has been cleared.