Persona 4 The Magician is a great read for those who are already emotionally invested in the Persona 4 franchise. The original P4 media already does a good job with presenting Yosuke's character, and this manga is a great supplemental read that adds to it even further. Being able to see more of Yosuke's background before Yu arrived in Inaba as well as the early interactions between them and seeing some key P4 moments from his point of view is what I wanted from this manga, and that is exactly what I got. TLDR; It's decent as a standalone story, but in order to appreciatefully you need to read/watch/play the original Persona 4 story.