[True Ending Spoilers] I need closure.

[Kirosi]

Do you think the gang forgave Sunny? I'm having a really hard time accepting what him and Basil did. I don't know if I could if I were Hero.

Forgiveness is a big part of the game but how could you do something so disrespectful to the body of a person you loved?

[Sbeve]

Aubrey literally did a repeat of Sunny's actions, just with less grave consequences (accidentally pushing Basil into the lake whilst fully knowing he can't swim).
Kel has been calling Sunny literally every week even though Sunny wouldn't respond to any of his messages.
Hero has been wracked with guilt because he believed he couldn't save Mari from herself despite being closest to her.

My personal opinion? I don't see a reason why the gang wouldn't forgive Sunny, especially since it's an accident.

[Akat]

I'm pretty sure they eventually did. Hero receives the absolution he needs learning that it wasn't his fault that his soulmate died, and that he did indeed know and love Mari's true self all along. Aubrey's new friends will most likely provide support for her, and help her reach the point of forgiving you. Kel was the only person to reach out to you this whole time, and won't burn such a sentimental bridge. Basil shares in the blame, responsible for arguably the worse crime, so it's not entirely your fault to begin with.

Unlike you, Sunny himself has absolutely no doubt in his mind that his friends will forgive him. After all, literally the last thing he has to do before he can come clean is kill Omori who represents all the self loathing and the doubt that his friends would forgive him.

If you want closure, you have to erase the Omori that's still somewhere inside of you.

[160mgCaffeine]

(Moderate Spoiler Alert) I believe that the gang did forgive Sunny and Basil because in the Secret Good Ending, we see both Sunny and Basil's SOMETHINGs disappear. I think this indicates that they can finally let go of the past, a reaction which would not be possible if they weren't forgiven.