Definitely in my top of turn-based strategy games. The plot is interesting right up to the ending (which depends on the player's choices throughout the game), all units are useful in certain circumstances. They are also upgradeable, but the game can be completed without any of them.
Maybe SPOILER below.
I'm not sure about 2 things
1: Is it possible to help all 3 of them in the "Quiet village" mission?
2: There are 4 units in the last row of the book, or did I miss someone?