[[caption-width-right:200:If you wish to die, you will find yourself on this island]]

''Suicide Island'' is a manga that seems to be rather obscure.

Lately, Japan has been suffering from an influx of suicide attempts. Taking care of suicidal patients costs a lot of money, money that the government is not quite willing to spend on them anymore. So when a suicidal patient comes into the hospital bleeding, gagged or high on drugs, they ask a question: ''Do you really wish to die?'' If the patient answers yes, a waiver will be signed and everything will go peacefully black...

Only for the patient to awaken in an unknown place! A sign near-by explains their confusion.
Since the patient does not wish to continue living, they have been legally declared ''dead'' to the government and have been sent to this Island, with everyone having washed their hands off of them. Instead of expecting the assisted suicide they were expecting, they have been flung away like garbage into a corner that nobody cares about.

Of course, the government tells them that ''anything'' is allowed on this Island and there are no rules... except one: ''Do not even think of escaping''. Escape is the only prohibition. Everything else is free to go, including ending your life or... assisting others in getting rid of their life.

The story itself starts off when Sei, a young teenager, ends up sent to the Island after another attempted suicide through drug-overdose along with other suicidees. They try to figure out what is going on, how this island is shaped and even begin to simply plan their lives here...

!!This work contains examples of:
* AttemptedRape: On the first night [[spoiler: Sei]] is too afraid to speak up during an attempted gang-rape of a fellow islander until it is stopped by [[spoiler:Ryou]]. This later drives him to save [[spoiler: Liv]] from a similar fate.
* TheArcher: The protagonist was in the archery club of his school and uses his knowledge to hunt deer on the island. [[spoiler:He has shot at least one person with it, driving him into moral self-doubt]].
* {{Badass}}: Sei eventually grows into a veritable one.
* BreakThemByTalking: [[spoiler: Kai's favorite method of getting people killed is approaching them when they're most fragile and talking them into suicide]]
* BrokenAce: Ryou's natural strength and charisma help the other survivors cling to life, and when threats arise, his presence is usually enough to scare them off. Everyone thinks Ryou so unshakable that they sometimes forget: there's only one way anyone gets to Suicide Island.
* BrokenBird: The originally-unnamed girl [[spoiler: Maria, renamed Liv]], whose background has broken her into what she sees herself: a "doll" that has no meaning in life and sees no reason to continue living.
* DrivenToSuicide: A DeconstructedTrope here. A number of characters have played it straight, or attempted to, and this resulted in the government wanting to wash its hands of them and save money. Once on the island, many participants decide they prefer to restart their lives; others take the plunge and descend into hedonism, despair, and death. [[spoiler:Sometimes with assistance.]]
* EntitledToHaveYou: [[spoiler: Sei]] feels this way about [[spoiler: Liv]] after rescuing her from her would be [[AttemptedRape rapists]]. He quickly snaps out of it though.
-->[[spoiler: '''Sei:''' I'm the one who protected her. This woman is ''mine''.]]
* EmbodimentOfVice: Sawada.
* EvilCannotComprehendGood: [[spoiler: Kai, having induced people to commit suicide all along and even murdered someone, doesn't understand why the rest of the main cast want to live so badly. He eventually snaps and tries to kill them all.]]
* {{Foil}}: Kai to Sei, especially after [[spoiler: TheReveal that Kai killed one survivor]]. Both ponders that HumansAreBastards, but while Kai try to solve the problem by [[spoiler: killing, thus removing humans]], Sei actively tries to search what roles can the survivor take in the Nature. [[spoiler: His answer is to be the top of the food chain to balance the ecosystem.]]
* GoMadFromTheIsolation: The old man in the mountain averts this. He actively avoids human contact, yet is possibly the mentally healthiest person on the island.
* HeroicBSOD: [[spoiler:Ryou, after trying to strike out on a raft and discovering that the government will not permit escape.]]
* {{Hikkikomori}}: Sei was one, locking himself in his room and barely even talking to his parents.
* HumansAreBastards: A major theme of the manga is the adherence to first-world morality in the absence of a justice system: is it noble, or naive? What is the true nature of human beings? Sei's own admiration and respect for the forest fauna leads him to compare the worth of their lives with that of his fellow survivors, who often quarrel and cheat each other.
* HumanShield: The defensive tactics employed by Sawada and [[spoiler: Kei]].
* ImAHumanitarian: Rumor holds that, at least, the leader of one camp on the other side of the island has fallen to eating human flesh, which leads to...
** MonstrousCannibalism: Implied and used by said leader to control his camp. And quite effectively too.
--> Sawada: [[spoiler: (After killing someone with Molotov Cocktail)]] Tonight I'll eat meat for the first time in a long time.
* [[TownWithADarkSecret Island With A Dark Secret]]: The entire Island is unknown, except to the people on it and the higher-ups in the government. Outside of that, it first seems like a simple island that the suicidees are being dropped in, but according to the old man in the mountains, this island was originally a place to bring serial killers and murderers to.
* ItsAllAboutMe / TheSociopath: Sawada again.
* MeaningfulRename: There's a girl whose name hadn't been revealed for some time. When she eventually admits [[BrokenBird her]] [[DarkAndTroubledPast past]] to him, revealing her name to be Maria and how she hates the name, Sei gives her the name Liv.
* NatureHero: Sei, eventually.
* NietzscheWannabe: Kai. He believes firmly that humans have no place in the world, saying that since the world is so beautiful, why is mankind even on Earth to begin with? He doesn't think that mankind has anything to contribute to the world. [[spoiler: He even tries to kill the entire group just because he felt like it.]]
* RapeAsBackstory: For at least one character, if not more.
* RedemptionEqualsDeath: [[spoiler:For Yoshimura.]]
* {{Robinsonade}}
* SexSlave: The fate of the women who ended up on Sawada's side of the island.
* ShownTheirWork: The author puts plenty of text explaining things, ranging from the "proper" way to cut your wrists if you want to die, how to make a bow and hunt deer with it, what goat meat tastes like, etc.
* SpellMyNameWithAnS: Liv or Lif?
* StayInTheKitchen: The view most male characters hold in regard to the female population on the island.
** When [[spoiler: Tomo]] comes out as transgender, a characters first response is saying sorry for having forced her to help protect the group with the other men. [[spoiler: Kai]] takes this [[UpToEleven up to eleven]] before being told [[ShutUpHannibal to shut it]] by Ryou.
** [[spoiler: When war breaks out between Sawada's faction and the good guys the [[GuysSmashGirlsShoot women are taught archery]] by Sei.]]
* SuddenlyAlwaysKnewThat: Sei knows a lot about hunting and preparing meat for being a self taught beginner. Doubles with [[InformedAbility informed disability]].
* TeamPet: Ikiru.
* [[ThatManIsDead That Woman Is Dead]]: One of the survivors tries to fully dissociate from her past, to the extent that she refuses to be named. [[spoiler:Sei later helps her to a MeaningfulRename as she decides to live anew.]]
* TheNeedsOfTheMany: The survivors has developed into this since they decide to be alive, adopting the rule that those who don't work don't get to eat. There are those who just simply take food rather than earn it, but they are losing ground against the rest.
* TheseHandsHaveKilled: Sei when he thinks he accidently caused someone to fall, didn't help him and ended up dying. [[spoiler: Happens again when Sei simply ''injures'' someone with an arrow, albeit the type of injury being practicaly a death sentence on the island.]]
* {{Transgender}}: [[spoiler: Tomo's]] deepest secret, and reason for being on the island.
* {{Unperson}}: As far as the government is concerned, ''everyone'' who ends up on that island does not exist anymore.