My first thoughts are that the game is very, very generic. If you had a bingo card of JRPG tropes you'd call bingo before the first hour was finished. Just because something is generic doesn't mean it's bad, though. A witch named Hilda is out destroying towns with her song of ruin, and our only hope of stopping her is to gather the other four witches so that they can sing a magical song that will stop her evil plot. The most heavy influences in my mind are Ar Tonelico and Summon Night - Ar Tonelico for the song magic and the 'tuning' mechanic which seems (so far) to the equivalent of 'diving' in AT in that you enter the witches' spirit world and talk them out of their problems. I guess Fate/Extra CCC did the same thing, so this isn't new territory for Imageepoch. The game is broken up into 'mission time' where it's time to go advance the story and 'free time' where you have 3 'turns' to do various things like talk to your party members to raise friendship. Not just with the witches, you can raise affection with your male party members too and have them learn new combat abilities - this is one of the parts that reminds me a lot of Summon Night (along with the SRPG combat and bonus objectives), where each day you only get a limited amount of time to talk to your favorite party members and raise your friendship levels with them. You can also use your free time to do a quest from the bar for some coin, or go on a search for items.
On to Part 2