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 -...