This game is a slot machine, but that in no way means it can't also be a PvP game.
A good chunk of the game involves taking money from other players, in essence, battling against other players. The problem is that the ammunition to attack others is random, but someone who is willing to pay will have more chances at getting that ammo. Then the fact that there is a revenge system goes to show how much it eggs players on to attack back, in which the other player now receives a revenge towards you, creating a chain of back and forth for who has the best luck, who has the most money and whose friends have the best luck and money, as you can send your friends at them too.
Then we have the matter where someone can easily take all your money within seconds. When I tried playing the other day, the game bugged out and froze and within the timeframe of refreshing the game, I had all my cash, over 1mil, stolen by a single person. Not even by multiple people. The further city you're in, the more difficult it is for you as the amount you need increases but the amount you can win from the roulette doesn't change, only the amount you can get from attacking people(?) it seems. Imagine late game when things start costing more per icon, enough that you have to use a good amount of all your rolls just to get one or two icon. What will be your main source of income? Expecting multiple 100k drops from the roulette? Yea right. It's attacking other players, cause sure as heck you're not going to be getting much from the roulette but good luck not getting attacked back or having all your funds taken by someone else.
So like I previously said, this game sole purpose is to suck money out of people. It is essentially an RNG simulator with some hentai pics as reward but with a PvP game system shoved in to encourage people with money throw money at each other. Free players will progress so slowly, they'd be better of just googling porn. The game probably cost so little to develop that it won't have any problems surviving on nutaku.