Awww cute :3
She even refers to the real Nazuna as "nee-chan" aaaww :3

Also I found some info about the new thing in shop.
A person wrote some info about it on FKG FB so this is a copy paste from his comment

*buy step up gacha from android/ios version. there are 5 step of step up gacha and every step is 120yen. every step will give you 4 of that kakera which on total will give you 20 kakera which can be traded with that ticket

*DMM ver of step up gacha didn't give you that thing btw, it's just to make mobile ver equal with DMM ver due to step up gacha in DMM is only 100DMM point per step, and also the point can be earned by doing daily missions


Its a bit convoluted and not exactly clear what its implied, but it seems its some new sort of currency we will be able to gather and once full, exchange for a ticket. What sort of ticket that is (random or pick) is not yet known.
I am sure we will get better info as time goes on.