School Days ending was jut messed up.
It was already messed up after episode 5, really messed up between episode 5 and the last episode and ultra messed up at the last episode.
Phantom:Requiem for the Phantom's ending was also wrong.
I loved the entire series but the ending just made me want to crawl in a hole and die.
They could've done a regular happy ending but nope.
Danganronpa: The Animation's ending was just plain stupid.
Death Note's ending was good, but I would've preferred a different one.