What's a crow?

Wouldn't it be helpful to check the reviews on Google Play?

The game is a common raising simulation genre, and the fun... well, it depends on personal taste haha

Ravens are gacha items in the event. The game is similar to wos, where you just build, train troops, and attack other castles.

Ravens are a currency for gacha pulls, and if it appears on a Time Quest, you must accept it and then install the game. As stated in the participation guide, if you install first, the Time Quest will not be displayed. I've played this game before and personally, I found it fun.