Sorry, it's just a bit too much, almost every choices we have to pay with diamonds and it's not only cost 10 but also 50 diamonds too, so this game is not a f2p friendly, unfortunately. And characters costumes are required to buy because it can boost hearts for the LI, it cost 150diamonds per costume :") so you have to pay to be able to get the happy ending/good ending for all of the LI :")