If you're looking for manga similar to syudou: Toriatsukai Chuui, you might like these titles.
Ougokujima: a heavenly island where everyone, adults and students alike, can live happily and peacefully. It's said that if you can live on this island, you're sure to have a rich and fulfilling school life that will make your youth incredibly satisfying... But all of that is only the island's outward appearance. In truth, the entire island is a place of insanity, filled with nothing but believers being manipulated by a certain cult religion. Every single one of the island's inhabitants have placed their faith in... "youth"?! That's right. Apparently leading a life in which one has celebrated youth to its fullest will bring a person the closest they can possibly get to God. Thus each day, all the islanders behave as if they are the main character of their own story... But since transfer student Shuuichi Mugi has realized the truth behind this island, will he be able to avoid all the insane "stories of youth" that happen one after another, and escape from the island of cult followers?!
Suicide is on the rise for no apparent reason, affecting adults and children alike. All they have in common is accounts in a brutal online game called Dystopia. When tragedy strikes a woman named Hitomi, she soon joins Dystopia and explores its horrors. But when she realizes the game feels a little too real, it’s up to her and a genius hacker named Shunsuke to figure out what’s really causing these deaths.
Jefferey Ryan had a troubled childhood: he never knew his father, and his mother died when he was seven. Years later, Fate made it up to him with a loving wife and a beautiful daughter, and he was happy at last. But the rain that was falling the night Jeffrey discovered his mother’s bloodied corpse never seems to stop, and continues to haunt him...
Dante's life on Amigasa seemed normal enough to him, even though everyone around him called him an oddball. But when a chance meeting with a young woman named Aoi changes everything, Dante can no longer sit idly by...unless, of course, he is made to!
"Just how many more times can this girl's heart beat?" Kokokudou Yuuga, a sick boy with 5 days left to live, meets Kurotani Rimu, a sick girl with 1 month left to live. They become fast friends due to their similar circumstances, but can their relationship blossom when it has a time limit on it?
A human drama set in a riverside hotel at the boundary between this world and the next.
Masato, a son of the Tendo family, is meant to marry Hojo Ran, the daughter of a baron. There’s just one problem: she’s a fake. The real Ran has fled after hearing that few make it out of the Tendo family alive. In her place is a young woman who says she will die if it means saving someone else’s life.