So I made a mistake on the timeline...
Okay first of all, Nozomi's parents separating took place four years before from the current date.
Nozomi would be thirteen and Yoshiko would be Nine.
Then the day Nico found Nozomi would be two years after. So Nozomi would be fifteen (so is Nico) and Yoshiko would be eleven.
Ages -
From the current time:
Nozomi - Seventeen (All third years)
Kotori - Sixteen (All second years)
Maki - Fifteen (All first years)
Kotori's accident:
Nozomi - Fourteen (All third years)
Kotori - Thirteen (All second years)
Maki - Twelve (All first years)
Nozomi's accident:
Nozomi - Thirteen, not eight (All third years)
Kotori - Twelve (All second years)
Maki - Eleven (All first years)
Hope you guys understand. If you have any questions feel free to comment it and I'll try my best to answer!
Other than that, see you guys in the next chapter! Bai~~