Where and/or how do I get Sakura Money and Karma Phages?
Sakura Money and Karma Phages are rewards from the missions. Just keep clearing missions and you’ll get all the Money and KP you need.
BTW, you have to claim the rewards from the first tab of the shop. It works more or less like the Master Missions interface. This being the first event with this kind of mission that I’ve played in heavily, I didn’t remember that to start.