I'm going to say that this wasn't very good. It was trying too hard at some sort of psychological realism to be plain smut, but not very good at being psychologically realistic. Or situationally realistic: "I am serious manga, also panty shot." The characters jump on each other without being good smut. The non-con elements just feel like grooming and/or abuse. If it was trying to be subversive, "this is what your porn fantasies about 22 and 14 yo would actually be like", it didn't really pull that off either; Ema diving into crotch-sniffing is just too out of the blue.
All the characters seem to be centered on reality enough.
Anna’s inner turmoil is understandable, a girl who is experiencing lust and love first hand so she’s overwhelmed with trying to differentiate her emotions.
Ema was essentially used and toyed with until she finally said enough, which let’s face it most people don’t know when to stop being a doormat.
Miku from what it seemed like, was giving way too much to her cram school teacher, letting him dictate their relationship. She was on the rebound and latched onto the nearest person who offered her comfort.
Yoshino, I honestly can’t understand her and perhaps that’s the sense of reality she brings to the story. You don’t understand her motive yet you know she brings chaos, which sometimes life doesn’t have reason in order to be filled with disorder.
When we dive into the story, Anna and Ema seem to have been living together for more than a few days so maybe Ema’s panty sniffing wasn’t that sudden perhaps? It’s not like they just met. It seems like Ema’s been attracted to Anna for a while...
Anna and Ema live close enough together that Anna can keep going to the same school (granted with Tokyo transit that's not a huge constraint) and Ema is considered relative enough to shove Anna onto her, yet they've barely met beforehand. o_O
There’s an 8 year age gap between them so maybe when Anna was old enough to remember who she was hanging out with, Ema was already wrapped up in her studies.
Also, maybe Ema is a relative from her fathers side? Since the mom makes that comment about her dad makes me think he was the one who wanted Anna to live alone? Maybe their dads go golfing or something so the parents know each other but the kids don’t know each other.
And a college kid who lives alone and has a part time job while getting good grades might enough of a good resume for temporary guardianship of a 14 year old for some. Especially if Ema was going to a top university.