All these fools saying the ending is "bad" (yes, I know it's just SSS, but look at the previous chapters' comments!), what's with them?? I absolutely love Part 4's ending! It represents just about everything the Part is about! Kira's last death to an ambulance, unnoticed, is thematically coherent and appropriate, and is honestly the best way for his to go, with an unsatisfying crunch
Okuyasu's death and return completes his arc of finally choosing for himself, choosing his town and friends over his brother.
Also... what's with that guy's hate-boner for Koichi? He's a damn good character