The story is solid and great.

In the beginning, energy was supplied well, lots of items were given, and money was collected easily, so leveling up was fast... When you level up, your energy refills... I started from level 1... and before I knew it, I had played for over 3 hours... I passed level 30 in just one day... It's fun. Perfect for killing time... No, it's not killing time, time just melts away. lol