I am biased, because since Kamidori Alchemy Meister I love Eushully games. It is true, that I also took a huge break in Kami no Rhapsody around Chapter 7-8 (I've completed Kamidori Castle Meister instead), but in the end Kami no Rhapsody was a fun experience as well. It is grindy and yes, limited in deployable characters, also, the medal equipping mechanism was strange for me as well (more so, when I couldn't check a missions objective on the map, just after the mission has started), but the story is fine, the combat is good and the art is magnificent as always. I gave it an 8/10 (Kamidori Alchemy Meister and Amayui Castle Meister is a 10/10 for me).
What spoilers would you like to hear? PM me if you like.