So who will like this and who won't. In my opinion, those who would like this are those who want a show that makes them think a little. Not in a way of changing your world view or whatever. But the show has a bit that it throws at you at any moment, and you might feel overwhelmed if you miss given bits.
Those who might not like this is those who want a show that you can "turn off your brain".
Something that should be noted is the animation. The animation of how someone can turn into a fish, a cat, water, and so on is great. The people who worked on this actually put the extra mile in. But at the same time, this is what gives you a lot of info in a short bit.
The overall story is kinda basic. In short, it's basically a group that use "mind powers" by changing people's memories, change their happiest moments, and so on. They try to explain it off like they hypnotize people. But at the end of the day, it is mind powers since they can go into your thoughts, see what you see, have private meetings in your head, and so on. It tries to play this as this is happening in the real world, and this group is mostly using their powers for a mafia like group.
The show more than less gets into the personal relationships between each other in the group.
In my opinion, it is worth a watch.