Ohhh lately I've been playing Fate/Grand Order alot, I actually never thought it would be this good for a free game (that is actually playable without spending a penny on it and isn't tedious). About the game, it's basically about fighting in a war with your Servants as their master, you can choose your genre and kind of customize your costume (each one has different traits), it's a combination between Visual Novel and turn based fight system, it has fun events for special holidays and the Servants are awesome for the most part (I just hate one so far, whenever she comes up in the gacha i feed her to the other servants to enhance them lol). Each Servant has a story, and I'm pretty sure everyone has a special VN, at least my servants do. Art is so pretty, voices and story are pretty nice too. I recommend it :)
Fun stuff: servants are incarnations of real life people that existed in some point of our history or literature characters, like King Arthur, Jeanne D'arc, Leonardo DaVinci and Jekyll & Hyde.
sorry it's long i just love this game XDDDD