i am super confused, last chapter misaki said that the aging thing was given to her at the age of 4, but this chapter says 4 years ago misaki and aoi were about the same age (7 or 8)
3 possibilities
1 misaki was given the age thing at four and it only activated at 8 (makes no sense because why wait)
2 aoi was born first and misaki accelerated to aoi age with age thing (then would aoi be confused about the rapid ageing, they grew up together)
3 typo (which i subscribe to)
Hello! I'm the translator for this chapter and I wanted to clear up your confusion by drawing up a time line.
12 Years Ago - Aoi was born
11 Years Ago - Misaki was born
4 Years Pass (7 Years ago)
Misaki - 4 Years Old - Gets the Growth Capsule
Aoi - 5 Years Old
3 Years Pass (4 Years Ago - Flashback Time)
Misaki - 10 Years Old
Aoi - 8 Years Old
[In the flashback they mentioned that if they would disable Misaki's capsule in time, then she'd be 12 years old and Aoi would be 9, so it lines up.]
4 Years Pass (Current Time)
Misaki - 18 Years Old
Aoi - 12 Years Old
So Aoi is actually one year older than Misaki! And the Growth Capsule is working just as intended, it didn't activate later on or anything.