-Mother's face looks very similar like face of Nanase!
It could be coincidence if there's not another similarity:
-Mother was always busy and Yuni waited for her to come home.
Sounds familiar?
I'm curious if someone noticed same things as me, or have any thoughts about what I said?
Don't see the facial similarity, but you're cooking with the similarity between Yuni's mom and Nanase.
Both are too busy to spend much time with Yuni, who is lonely while she waits for them.
I know I'm reading into this too much, but I saw parallels with the exchange about eating pancakes:
Yuni: "Here's your yakisoba(Nanase)"
Yuni's mom: "Tonight I want pancakes(Fuuko), not yakisoba(Nanase)!"
Yuni: "Ok you can have pancakes(Fuuko), just make sure you eat the yakisoba(Nanase) tomorrow."
That aside, Yuni's dead cat clearly represents Fuuko. The cat kept her from feeling lonely. She grew extremely attached to it and misses it now that it's gone.
Yuni wondering why the cat had to die despite trying so hard to live...
Yuni being unwilling to move on, choosing to endure the loneliness instead of getting a new pet...
Yuni was devastated about the cat dying but felt just as bad about how her reaction made her mom cry...
All are topics that could be dissected.
I'd always considered this more of a guilty pleasure "watching a car crash" type of read, but this chapter felt like it had a ton of depth.