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I am confused by the whole premise. Not by the fact that Hikaru died, and some thing copied him, no. What did Yoshiki notice? Why only after 6 months? Although if that was something minor - that's fine. But then why the world started reacting to Hikaru after 6 months as well? Like that old lady, and the cat. I can understand a couple of weeks, but half year does not sit right.
Episode 2:
So many shots from behind the hair. Are they trying to save money with this? But then it looks like more money was put into other stuff, so, do they really save anything? Still don't see where all of this is going besides BL vibes and some level of creepiness.
Episode 4:
I am not hooked. They finally acknowledged Yoshiki's silence for for 6 months, which is good, but overall it feels like it's going nowhere. It can look somewhat stylish, and there are moments that are quite atmospheric, but it still feels shallow. Just like the thing using Hikaru's body. In that sense it feels like Takopii (the character, not the anime necessarily) to me: some things are being told and even shown, but they do not feel... "Real". It's like they are said/shown because they are expected to be said or shown. Maybe that's meant to lean on the "surreal" part of the show somehow, but Yoshiki is a human, so at least he is supposed to feel real, and he does not even if I adjust for trauma.
So, dropping this. Maybe if this was a movie it would work for me, but as is I am bored most of the time.