Dear ladies and gentlemen, I present to you how Jiro and Taisei have met. Now everybody together: Awwwwwwwww!
The way Taisei immediately thinking of Yuudai as a friend, and Yuudai being oddly confused by it. Because seriously, Yuudai is always such a Jerkass to everyone, but he really doesn't have any friends. Being showed kindness like that and Yuudai being taken aback by it was really adorable.
Or Taisei genuinely complimenting and being nice to Yuudai, and Yuudai pretty much showing that nobody ever does that for him. Dear god, that guy needs some hugs.
Genji apologizing (after Taro already left, but still), after he had taken some money from Taro in a very unfriendly fashion, which showed that he really isn't such a bad guy after all, that he didn't lied about being in money trouble, and that he does feel genuinely sorry. After all, Taro already left and nobody would have heared him anyways, which makes it kind of a What You Are in the Dark moment.