Morning Glow is Golden: The IDOLM@STER - Vol. 1 Ch. 1

[MangaDex]

 

[KN-XIII]

Considering in chapter 2, we know that Kotori's mother already passed away when she was still a child, on page 10, it should be:
"I want to go to the same school as my mother went in Tokyo!"

 

[RoboMochi]

Long haired Kotori is best Kotori!

 

[DanJADO]

Kotori has so much Haruka vibes

 

[Ahodegozaimasuru]

Takagi shachou really unleashed his inner deremas anime producer instinct here.

 

[Ahodegozaimasuru]

Kotori has so much Haruka vibes

This becomes truer the longer the series runs too.
Kotori's whole vibe is "nostalgia" and while Haruka didn't start out that way, she eventually turns into the nostalgic idol for many.