The demonic setting of Phantom Seer reminds one of many previous Shounen hits like Bleach, Demon Slayer or Jujutsu Kaisen, so maybe its not extremely original in this aspect. The story is quite decent but nothing overwhelming. That shouldnt stop you from reading this series because while it has some story weaknesses it still strongly supported by the humour of the characters and their interactions.

Iori the main protagonist is interesting in that sense that hes not quite motivated in being the hero, more the opposite at the beginning while other Shounen heroes are unrealisticly over enthusiastic everytime. Thats what I found relatable in him that he can be lazy sometimes like everyone of us. What I also like about him is that hes powerful at the start but not overpowered so he learned everything beforehand. His abilities that connect with phantoms and shadows and how he uses them is well executed in my opinion.

Aibetsu the other main character seemed one dimensional at the start but got more fleshed out as the time went on with some dark revelations concerning her powers. She doesnt have to be saved everytime and learns to fight for herself.
Also Yayoi, Ioris sister is an even stronger female character at the top of this world and thats what we need more of in the Jump magazine.

The art is beautifully made and it was a pleasure every time to look at while reading. Theres something in the way the lines are swung that fit so perfectly and I cant really describe it. The main villain design draws heavy inspiration from the spiderdemon from Demon Slayer which you will notice when you see it, but isnt a cheap knock off, he has different abilities.

Another really important aspect is the horror element with the horrifyingly drawn demons and faces which captures the atmosphere very well. There are also some quite disturbing scenes later that add to this shock factor.

Overall after reading its first 18 chapters I recommend this series, also because i forgot to mention, the worldbuilding was also not bad with the whole different shaman organisations and Ioris and his sisters backstory not fully uncovered there is quite some room to explore in the future.