Harsher in Hindsight: You know that thing about Sunohara barely showing up in After Story, even though he's meant to be Tomoya's best friend? Gets a lot sadder if you've played Mei's route in the visual novel, in which Sunohara claims that he and Tomoya are close enough that they'd definitely stay friends after they graduate. Guess Tomoya was right to be skeptical, after all.
Sunohara: The friend I have right now is not related to me just by the school. Even if we graduate and more far away... Even so, when we have holidays we'll come and meet... That kind of relationship.
Tomoya: Sorry, but far? Really? [...]
Mei: From now until you become an adult... Even if your surroundings change... You guys will still be friends, right?
Sunohara: ...yeah, that's right.