This may be a bit off topic, but I am introducing a Machikoro app. This is in fact not totally related to the original boardgame. In fact, this is a new game run by a Japanese company. The game supports single player and multiplayer, it's free of charge and includes some in game purchase option. But I have played the game for 3 weeks now and I can say you can play equally well without any IGP items.
The game is quite addictive, it changes some minor rules from the original Machikoro. For example, you can build your own deck and add your favourite building cards and character cards into it. I think that improves the game play a lot. The game does contain quite a number of Japanese, but I can try to help if you don't understand.
The official website of the "Machikoro Match" App: