To be honest Jagaaaaan is like nothing I have read ,just the whole frogs falling from the sky thing struck me as unique.
The art style is great, the author real captures human emotion and you can tell what kind of person someone is just by their face. Also, the fight scenes aren't lacking either, there's tonnes of great abilities and seeing them put against each other is honestly a spectacle.
The manga really shows you the harshness of reality and how cruel people can be(sometimes it gets pretty dark).Some people have pretty sad back stories, one to the extent where I found myself sympathising with an antagonist.
Jagaaaaan's main character is intriguing, at the start of the manga he's presented as this pshycho "shoot em up" dude but then becomes a bit softer, this didn't bother me but it did turn others off. However, at the manga's current stage i believe the MC isn't like that anymore.
Overall,Jagaaaaan is great and you should definitely check it out.