However, the story and remaining characters of the show are mundane, unrealistic and at times even cringeworthy. I will preface this by saying that I am not Japanese - I am an American university student and a relative newcomer to anime. However, I have been around the block and have seen a few extremely well-done romance anime in the same vein as Kokoro Connect (Toradora!, Clannad, Monogatari), so I feel like I have a solid foundation upon which to base my opinion.
Let's start with the story. As I mentioned earlier, the concept of body switching is actually a great idea and works very well in the high school drama setting. It is a mystery to me, then, why Kokoro Connect decides to just scrap it less than a third of the way through the show and change the supernatural events afflicting our main characters. There is so much untapped potential with the body switching premise that I would have loved to see. For example, much of the drama in the second half of the show could have been either avoided or played out much better if an extended body switch had happened between two characters that forced them to interact with the other's family, learning firsthand what their true daily life is like and further clarifying their root sources of trauma. Really, that's almost the entire point of body switching in a non-erotic setting - you are forced to spend a while in someone else's shoes and learn about them by living their lives. Instead we get mental thought transmissions and "acting on your inner desires". The first one is sort of interesting, but nowhere near as deep as body switching. The second one isn't even a supernatural phenomenon - it's called teenage hormones. I personally think this show could have done a lot more with 8-11 episodes of body switching only instead of dragging on for 17.
As for the main plot, it's mostly your typical Japanese high school romantic love-triangle borderline harem drama. There's supposed to be a main villain with Balloon Vine (Heartseed?), but there is really no point to his existence other to hand-wave away the phenomena as some kind of alien experiment. The point of this show is not explaining why these phenomena are happening, it's how the characters react to and deal with them together. You know at the end of the show you're going to get an official couple and that most of the character's problems will have been sorted out to some degree. I only wish that it didn't take so long to get there.
Moving onto the characters, we come to what I think is this show's largest pitfall. The vast majority of the anime's cast are either as bland as raw pasta or act so unrealistically that trying to relate to them becomes nearly impossible. You've got Yaegashi, the stereotypical "boku"-using protagonist that espouses Japanese ideals of modesty, uprightness and chivalry while having practically no standout qualities whatsoever; Iori, a girl whose angst over her identity issues make for a very inconsistent and erratic character over the show; Aoki, the secondary male character and the only person preventing this from being a harem; Kiriyama, a girl with androphobia but whose solution to this problem is to be saved by others rather than confronting it herself; and Inaban, a strong female lead who is brutally honest, playfully violent and a breath of fresh air in an otherwise weak cast. Seriously, if you watch this show for anything, watch it for Inaban. She's great.
The only other person worth mentioning in the show is Balloon Vine, the main "villain" whose stated purpose for causing the supernatural phenomena to happen to our main group of five is literally just to fuck with them. Does this story really need a villain? The show does no legwork in explaining who he is or what motivates him to choose a group of Japanese high school students to experiment on, or why there is apparently a second, rival alien also involved with our main group. Kokoro Connect could have had effectively the same plot by just introducing the phenomena without any explained source and exploring how the characters react to it.
The ultimate reason why I did not enjoy this show was because these characters' dialogue and reactions to the phenomena felt incredibly unrealistic. Yes, this is an anime with body switching. Yes, there exist harem anime that I like, and the concept of a harem is constructed from male fantasy and is as far from real life relationships as possible. However, I feel that Kokoro Konnekt tries to pass itself as a somewhat true-to-life look at how a bunch of teenagers would act in supernatural situations but fails because it can't even master the portrayal of regular character interaction. Yaegashi is such a white knight that I wonder how anyone could have a healthy relationship with him; Iori is irrational even by teenage girl standards to the point where I can't even see why she does what she does from her point of view; and Kiriyama feels hypocritical in that she wants to become stronger and gain self confidence but instead relies almost entirely on Yaegashi for emotional support throughout the show. Even Inaban can act a little unrealistically sometimes.
In summary, Kokoro Connect is mediocre. Its higher than average production values, good voice casting and pretty good character in Inaban prevent it from being a failure, but so many other aspects of the show drag it down from being at least a decent watch. I cringed and interrogated my computer screen out loud multiple times while watching the show because I could not believe why certain characters acted the way they did or why certain parts of the show were just never explained. At the end I was left with a feeling of dissatisfaction and that my time should have been spent doing other things.
By the way, I propose a drinking game whereby for every episode of Kokoro Kardashian you watch, take a shot every time you hear the word "Tasukete!", "Mamoru!", "Suki!", "Daisuki!", or "Baka!. If you make it out alive, I will personally reward you with a medal.
