The Youza event is a cruel one if you don't commit your daily stamina and more to it to get a good 6* unit. The event ran for 15 days and to get a 6* you need around 78 x 1* units. With what you have currently you sadly fall short of a 4* Youza but if you want to get the best you can follow these steps:
As per diagram above
Step 1:
Level one of your 1* Youza's to max lvl (being 5 I believe) with Tanukies (not another Youza) and then evolve her to a 2* which will use your other 1*.
Step 2:
Pretty much same as step one, lvl one of your 2* Youza's to max lvl using Tanukies and then evolve her to a 3* which will use your other 2*. This will give you 2 x 3* youza's, you would need another 2 x 1* to do step 3.
Step 3:
If you had the units required you could do this step. You would lvl one of your 3* to max lvl similar to the other step, the new thing you would do here is lvl one of your 1* with the other 1* Youza's which will increase her luck to 2 (max lvl doesn't matter for the 1*). Then you would evolve the maxed 3* to a 4* as per the diagram.
This is how many Youza's you would need for each * Youza. This doesn't include any higher star drop you would get from completing certain dojo floors, they would bring your count down:
But enough rambling on about that.1* to get 2* = 2x1*
1* to get 3* = 4x1*
1* to get 4* = 10x1*
1* to get 5* = 30x1*
1* to get 6* = 78
Seems I need to figure out how to join a guild of sort in IWZ (I have never really looked.).
It's funny you say that as they seem to have just added for this weekend some 40 free maga 5* gachas. Will see if I need any of the girls offered in them and weigh the worth of a possible good girl and using my magas for other things.