Having taken plenty of time to play through the game and all the character episodes, I can safely say that this is one of the most in-depth games I have played.
Character wise: I would tie the character development fairly close to Persona level as far as the development of backstories and the information involved. It was interesting to see that most of the characters are related to one another through a specific incident, which they are unaware of. That being said, each character has their own motivations and intentions, as well as their own disorders. It's easy with the diversity in issues to find at least one or more characters here to relate to. Whether it be loss, guilt over something you felt you could have stopped, eating disorders, or simply running from the past. The true question gets brought up multiple times if the Musicians are truly bad, or just by-products of the pain of their past. It all comes together in the end and is one of the best games I've played.

Story-wise: It's a great story, though at times mildly predictable (like THAT one musician....). All in all though it deeply develops the characters and really shines with the music ensemble throughout. The game does a great job at accurately portraying traumas to the extent that it seems one truly did their research developing it. It allows a fair bit of choice, including a bad ending if you want it.

Battle wise: It's turn based progression that allows you movement around a small board to use various abilities. I found early on that learning when to use healing and the emergency barrier are key to harder fights. The battles aren't difficult, but fighting same or lower level enemies takes less skill and sometimes I would just find myself spamming all the characters basic attacks. The game has a battle forecast function similar to Fire Emblem and others that allows you to see the hit chance, as well as what the enemy is likely to do next. This comes in handy for combo moves. Speaking of, a lot of the game involves juggling to increase the enemies' "risk meter" which just ups the damage similar to criticals. Higher risk meter makes some moves use better combos, and most of the ultimate moves from completing character episodes relies on them. Though some like Kotono rely instead on hitting airborne enemies.

All in all, solid gameplay, great character work, and top notch music. I'd play but again, but my backlog is full.

⣿⣿⣿⣿⠿⡿⠟⠛⣋⣉⣥⣤⣶⠆⢸⣿⡇⣿⣿⣿⣿⣿⡏⠻⣿⣿⣿⣿⣷⡙⡏⣿⣿⣿⣿⣿⣷⡌⢿⣷⡘⣿⣿⣿⣿⡇⣿⣿⣿⣿
⣿⣿⣶⣿⣿⣿⢰⣿⡏⣼⣿⣿⣿⠀⢸⣿⡇⢿⣿⣿⣿⣿⡇⠇⢹⣿⣿⣿⣏⠳⠘⢹⣿⡈⢿⣿⣿⠻⡌⣿⣿⡜⣿⣿⣿⡇⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⢸⣿⣧⣿⣿⣿⡿⠀⠸⣿⣇⢸⠹⣿⣿⣿⣿⠀⠀⢿⣿⣿⣿⡆⠁⢸⣿⡇⡜⣿⣿⣧⠀⠸⣿⣷⡘⣿⣿⣧⣿⡟⣿⣿
⣿⣿⣿⣿⣿⡿⢸⣿⢿⣿⣿⣿⡇⣷⡄⢻⣿⡈⠀⣿⣿⣿⣿⡆⢰⠸⣿⠿⠿⣿⠀⠘⣿⡇⣁⠸⠟⠻⠇⠀⢻⣿⣧⢹⣿⣿⣿⣿⣹⣿
⣿⣿⣿⣿⣿⠁⡀⣿⣸⣿⣿⣿⡇⣿⣿⡌⢿⡇⠀⢹⣿⣿⣿⠓⠀⢀⣠⣴⣶⣦⣄⠂⠿⢰⣿⣦⣼⡆⢦⢀⠈⣿⣿⡆⣿⣿⣿⣿⣏⣭
⣿⣿⣿⣿⡇⠀⠀⠸⡇⣿⣿⣿⡇⠙⠛⢿⠈⠇⢠⡘⠿⢋⣉⣀⣄⢻⠿⠛⠋⢁⣩⣥⣀⢿⣿⣿⣿⣷⠘⣾⣆⣹⣿⣿⠸⣿⣿⣿⣿⣿
⣿⣿⣿⡿⡇⠿⠃⠀⠃⢹⣿⡿⢧⢸⣿⣿⣆⢠⡈⢣⡶⠟⠟⠟⠿⠛⢀⠤⠚⠉⠁⢀⣤⣀⣀⠉⠙⢛⡆⣿⡿⣿⣿⣿⡆⢻⣿⣿⣿⣿
⣿⣿⣿⡇⡇⢤⣾⣿⣦⡀⣴⣶⣶⣄⣿⣿⣿⡀⠻⣷⣾⣿⣿⣿⡶⡠⠋⢀⣀⣠⡾⣸⣿⣿⣿⣿⣆⠀⣄⢸⡇⣿⣿⣿⣷⠈⣿⣿⣿⣿
⣿⠿⠿⠧⠀⢸⣿⡿⠟⠛⠉⠉⠉⠁⠙⢿⣿⣷⢀⣿⣿⣿⣿⣿⣿⠀⣠⣌⣙⢛⣵⣿⣿⣿⣿⣿⠇⣸⣿⢸⠃⣿⡏⣿⣿⡆⠸⣿⣿⣿
⣤⣾⣷⠀⠈⠘⠋⠀⣀⣤⠀⣀⠀⠀⢀⣨⣿⣿⣿⣿⣿⣿⣿⣿⣿⣾⣿⣿⠟⠋⠉⣀⣀⣀⢈⡤⣪⣈⢻⠘⠀⣿⡇⣿⣿⣇⠀⢻⣿⣿
⣿⣿⡟⠀⡀⠀⠀⣾⣿⣿⣷⣌⣛⣉⣼⣿⣿⡏⢿⣿⣿⣿⣿⣿⣿⣿⠟⠀⠀⣠⠎⣭⢟⡹⢋⠜⠐⡡⠋⢠⡀⢻⢰⣿⣿⣿⢰⡈⢿⣿
⣿⣿⢳⠀⣿⣦⠀⢙⡿⠛⢋⠉⣩⠍⣹⡿⣡⣾⣎⣿⣿⣿⣿⣿⣟⠁⣠⣤⢞⣡⣾⡿⢋⡴⡱⠂⢀⠔⣴⣿⣧⡈⣼⢻⣿⣿⢸⣷⠀⢿
⣿⣿⠸⡆⠙⣿⣃⡼⢁⡴⠉⡼⢃⠆⢌⣼⣵⣿⣿⣿⣿⣿⣿⣿⣿⣾⣿⣿⣿⣷⣟⣴⣿⢏⣴⣿⡧⠸⢸⣿⡟⣠⣿⢸⣿⣿⣿⣿⡆⢊
⣿⣿⡄⠳⡀⢹⣿⢢⠃⣠⠖⡰⠁⣠⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⣡⣿⣿⣿⣿⣷⣿⠟⣰⠟⠁⢸⣿⣿⣿⣿⣧⠈
⢿⣿⡇⠀⠀⠈⣹⡟⣰⢋⣼⢞⣴⣿⣿⣿⣿⣿⣿⠿⠟⣛⣫⣭⣛⠻⠿⣿⣿⡿⠏⣰⣿⣿⣿⣿⡿⠟⢁⣨⣴⡏⣰⢸⣿⣿⣧⣿⣏⡄
⠸⣿⣧⠀⠀⠠⣄⠻⢡⣿⣯⣾⣿⣿⣿⣿⣿⠟⣡⠖⠛⠉⠉⠁⠈⠉⠓⠀⠀⠀⢰⣿⣿⣿⣿⣶⣶⣾⣿⣿⣿⡇⢹⢸⣿⣿⣿⣿⣿⣿
⣆⢻⣿⣆⠀⠀⢻⣿⣶⣶⣿⢿⣿⣿⣷⡄⠁⠀⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠃⠸⠘⣿⣿⣿⣿⣿⣿
⣿⠀⡙⠿⣧⡀⠈⢿⣿⣿⢿⡙⣿⣿⣿⣿⣆⠀⠀⣰⣦⡄⠀⢀⣤⣶⣿⣇⠀⣼⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠋⠀⠀⠀⣿⣿⢹⣿⣿⢿
⡃⠀⣿⣷⡌⠛⠶⠄⠛⠿⠶⠖⣹⣿⣿⣿⣿⣆⢀⣿⣿⣷⢀⣿⣿⣿⣿⠇⢸⣿⣿⣿⣿⣿⣿⣬⣽⣿⠟⠁⠀⠀⢀⡀⢻⣿⠘⣿⣿⣆
⠁⣼⣿⠟⠀⠀⠀⠀⠀⠀⠻⣿⣿⣿⣿⣿⣿⣿⢸⣿⣿⡇⢸⣿⣿⡟⣋⠀⢻⣿⣿⣿⣿⣿⣿⣿⠟⠁⠀⠀⠀⢀⠘⠿⣘⠏⠄⡻⣿⣿
⣤⣉⡁⠀⠂⠒⠂⠒⡆⠈⣿⡆⠙⠿⣿⣿⣿⣿⢻⣿⣿⠇⢿⣿⣿⣾⠏⠘⠂⣿⣿⣿⣿⡿⠋⠁⠀⠀⢠⠄⠀⠀⠀⠀⡟⠀⠘⢇⠈⠻
⣿⣿⣿⣷⣦⣀⠀⠀⠀⣰⣿⠁⠀⠀⠈⠙⠿⣿⡸⣿⣿⣷⣾⣿⠟⣫⣾⣿⣿⣿⣿⠟⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣰⠃⠀⣰⠈⢷⣶
⣿⣿⣿⣿⣿⣿⣿⣦⣄⠉⠁⠀⠀⠀⠀⠀⠀⠈⠁⢹⣿⣿⣿⢁⣾⣿⣿⣿⠿⢋⣡⣤⠤⠀⢀⣀⣤⣤⣶⣶⣿⣿⣿⡏⠀⢀⣽⣷⣄⢻
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣦⡱⣶⣤⣄⣀⣀⣀⣀⣀⠸⣟⣇⠸⠿⠛⠋⠁⢒⣉⣤⣴⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠁⠀⣸⣿⣿⣿⣧
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣮⠛⢿⣿⣿⣿⣿⣿⣷⠌⣿⠀⣤⣄⣤⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠇⠀⢐⣿⣿⣿⣿⣿