Well, I finally done this. I played only REBF game before that, so has a little info about other projects and their connections, so some history and characters are mystery to me, translation not helping, but that readable at least. At first, this game has a great story and character developing. I like how it was going until end. Battle system a kind of cool, but for me some choices and bosses, expecially when you go for all items drops, are too dangerous, and your choices are too limited. You have a some cool skills, but you can't get them all, you could only choose some and create build, but there is a problem - in full battlebuild you not have any problems with any bosses at all, but also your drop rate for filling info about cards and enemy drops are almost zero, mixing also pointless, because even 200% boost is small. So if you want perfect full completed books, well... you will do a lot. Even you could got all sources of item drops in the game, you still could spent a great amount of time to fill the gaps... my 60 hours save not lie at all and I consider myself a decent lucky guy..... This grinding part was done awful, it's not mandatory, but still done very bad in my opinion. For only story and gallery you could not spent that time and collect very quickly. For H-scenes I still lack at much. It has great art, some voices and sounds always do good job for process, but all scenes have same patterns, with some exception, but they too rare. I think, what this BF games needed some improvement in process, add more unique scenes for any units, with more expressions after some choices in battle and go on. But that point of player, who clear a very big number of BF games, especially Karryn Prison, Lisa and the Grimoire, Ruled by Rule and much more, there are some good points, mechanics, but you want all them in one game....
So, I reccomended this game for trying or you could wait and complete earlier games of that developer (I believe in that in some day), for better undestanding a lore, it worth it.