[Spoilers for those who are not up to date]
Timeline of Astra's Story
Start
Year 0
Astra appears at the beginning of the MHA canon.
Astra develops the Mutant Slime quirk, changing the entire canon.
Astra meets her new family.
[Two months later] [Year 0]
Astra trains, improves her quirk control, and fully absorbs the slime.
[I'll continue it later, for now, I'll post it so that chapter 13 pops up, and you all will know that I uploaded a chapter. It skips to 12 because, well, I deleted the poll.]