It's very ftp friendly, I always manage to collect about 20 bells and 2000+ Houraitama in between events, which is 3x10 pulls at the gacha.
The rates are very good (or I just have the best possible luck lol), I almost always manage to pull the events SSR and often the UR, with enough tries. At worst, I get the event character at a lower rarity.
There's a lot to do in the game, which could be a bit overwhelming at first but you'll get used to it fast. They are constantly updating the game and adding more content and improving it.
The art is great, although some character CGs art can be a bit ehhh in the anatomy department. I like the way the game looks, the UI is beautiful.
The only real complain I have is that the final level cap at level 50 is just a bit too hard to break, but I can forgive it as it is the final one.
As for the stories, from what I could understand with my mediocre Japanese skills, I think they are pretty good too