Mutex

Besides an event, I think you could implement some features making it easier for new players to start, like starter packs, an ability to buy the first class change (for 100k, for example), the second class change for 1kk, since 3kk is quite a big amount of money for a beginner. Also, it would be nice to have D grade shots for sale in the shops, since you can't find players selling them nowadays, so you have to craft them yourself.