Finally, you can stack your solar gauge well done.
Seem now you can fire your solar-drive when ever you want, don't need to wait the girls turn end.
Don't know you can use all stack at once or not, I didn't test yet.

And yet another recycle gacha with Altemisia (black dress girl) is not 6*.
Another thing, the key still up as many expect, and they provide you more key.
What a useless item...