Chapter 61: Raku works his ass off working as Chitoge's mother's secretary for two days straight without even sleeping, just so he can make her spend Christmas with her daughter. He's the best fake boyfriend ever.
Chapter 62: After some near failures and a high speed bicycle ride through to the airport, Raku's hard work pays off and Chitoge and her mom clear up their misunderstandings and get some much awaited bonding time alone together.
Shuu's arc in the spotlight, where he has to deal with his unrequited feelings for Kyoko (their teacher). Shuu had decided to not trouble her with a confession. However, after some advice from Tsugumi, Raku literally kicks Shuu's ass into confessing, remarking that "even the most thick-headed person can tell that your having no regrets is a lie". Raku even treats Shuu to that meal he promised him afterwards! What a bro.
Chapter 98: Onodera's reason for going to Bonyari High: Raku. She considers it an impure motive for picking a school, but went through with it because being able to see her crush was the closest thing she had to a dream.
Chapter 115: Ruri is lamenting that that she didn't smile in what would turn out to be the last photo she'd ever take with her grandfather. Then Shuu show's up and gives her a photo of her and her grandfather fishing, both of them with big smiles on their faces.
A little bit before that has Ruri using a bunch of Shuu's photograph's of her and the gang, to show her grandfather that while she doesn't have a boyfriend she is far from alone.