I want to start off by saying I love stories featuring characters with any sort of mental illnesses because it adds a great depth of conflict. Now obviously the splitpersonality is not a very new concept with its very first debut in The Strange Case of Dr. Jekyll and Mr. Hyde. Theres been a lot of representations of Dissociative Identity Disorder which Im not really that critical about because I can suspend my disbelief for enjoyment. Ive seen movies and shows which dont potray the illness accurately but I still enjoy it because the conflicts the characters go through are still relateable and have depth towards them. WARNING MAJOR SPOILERS AHEAD: So when I looked around for manga that had this as a part of a conflict I was naturally intrigued. During the first arc where the MC Eiji Urashima the cheery one was discovering the existence of his alter B1 was great and also pretty typical. We also learn about how Eijis biological Father is a serial killer named LL who brutally tortured and killed young girls. Already adding a bunch of conflict which I personally liked. The first arc was basically the whole mystery around why B1 emerged to interact with gangs and it was really fun to see the dynamic. Most of the characters were pretty say generic as there wasnt much revealed about them YET. During the aftermath of the arc it was revealed that Kyouka Eijis girlfriend only got along with him because she knew he was LLs son and admired LL since she murdered her big sister who supposedly caused her to be abused. Shes revealed to be the one that killed B1s mole/rat showing her twisted nature. This was when I started seeing the flaws within the manga. I think it wouldve been better if they even subtly gave some foreshadowing as to her true nature instead of keeping it completely hidden. It wouldve made the reveal much more well fleshed out and it just felt like the author just came up with it on the whim. Then were stuck with B1 as our protagonist for the remainder of the series. A douche who is very unlikeable and the complete opposite of the initial halfs MC. The manga wouldve been a lot more unique or dynamic if they had the two alters interact with each other in some way because we never actually see them converse together not even through notes and it just completely wastes a potentially incredible character plot with it. Anyway near the end of the manga it is revealed that Eijis adoptive father is the true LL who framed Eijis dad and only did the murders because he was a psychopath. No hints no foreshadowing nothing building upto this whatsoever. Its just dropped like that. I had my suspicions on the guy ever since it was stated that he was the parole officer for the accused LL. But goddamn it really shows that the author never really planned any of this from the start. Plot twists are made just for the sake of it with no proper preparations or care towards it. In the end it is shown that Eiji Urashimi who was thought to be killed was probably inside him somewhere still alive. And then theres the whole B1s relationship towards Eiji as stated before has no real emotional impact or make any logical development on the character because their interactions are subpar. If they compensated this by at least putting notes/videos to interact with each other or even tried to make it so that the other alter were aware of what was happening while one was in control and actively was able to communicate wouldve made Eijis death a lot more impactful to not just the audience but to B1 as well. Forcing actual character growth and not some If you kill LL you become just like him which is a pretty bullshit ideology at this point lets be clear