Unmarked spoilers are ahead, per Spoilers Off rule.
When one of the authors is missing her deadline due to getting the flu, Onodera offers to head to the airport where she's at and help her finish the manuscript. Despite being told repeatedly that it's impossible, he persists and gets Takano's permission to go, and indeed, returns with the finished product.
Takano telling Yokozawa straight-up that he is in love with Onodera and always has been, and only sees Yokozawa as a friend. Even if you feel sorry for the the latter, it's hard to admit that he didn't have it coming with how he's been treating Onodera since day one.
Kisa telling off one of the many people who he slept with, who doesn't seem to get that a one-night stand is only a one-night stand.
Which is followed later by Yukina warning the man to back off — and this time, permanently — when he returned to hound Kisa again.
Also crosses with heartwarming, but when Kisa expresses his insecurities about his relationship with Yukina, particularly the fact that he doesn't know anything about the latter, Yukina then proceeds to state his name and every possible detail about himself, before ending it with "... and I'm in love with Kisa Shouta."
