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Surprisingly, the flashback of how Sumika and Nanami met each other.
The chapter where Manabu recalls a memory of him witnessing his grandpa help out a woman in an abusive relationship after she comes to their house for help. The woman didn't even really know him and only came to him for help because she knew of him from other people, yet he still helps her out without a word of protest. It really makes you understand why Manabu has such an enormous amount of respect for his grandpa.
The lengths that Sumika goes to snap Nanami out of her Heroic BSOD due to being rejected by Manabu. She's willing to go to Reina, who she's not fond of, tell her about what's happening to Nanami, and asks Reina not to break up with Manabu so Nanami can have him like you'd expect from someone like her, but begs her for her help.
What snaps Nanami out of her funk — seeing Reina roughing up Sumika, she fights the former not because it's their usual routine, but in order to protect the latter — just like she used to do when they were younger. The flashback showed how much the two cared about each other, this chapter just served to cement it.
Shiratori finally mans up and gets the courage to tell Hijiri that he loves her...in his own special way, of course.
Reina chews out Manabu for not telling her about his feelings about his family's ugly situation...because she's his girlfriend and she wants to help him, because she wants him to be happy when he's with her.
The 'Shiratori' arc that spans a few chapters in the mid-30s. Manabu and Shiratori begin to understand each other and apologise for unwittingly upsetting one another. Shiratori apologises because he realises that Manabu grew up as a "Well Done, Son!" Guy child because his birth parents neglected him. Manabu apologises because he didn't think his non-recognition of Shiratori hurt him so much even though he was just being himself.
Ch. 66: Reina telling Manabu that no matter what, she will support him and do everything in her power to be with him. He starts crying and all the readers start wibbling.
Reina: If your uncle won't recognize me as your girlfriend, then I'll make him, no matter how many years it takes. I'll never give up. I'll find a way to make it work no matter what.