is a Japanese manga series written and illustrated by . It was serialized in Kodansha's manga magazine Weekly Shōnen Magazine from November 2008 to January 2013, with its chapters collected in 21 volumes. The series follows a group of teenage survivors of a plane crash who find themselves in a mysterious island inhabited by extinct prehistoric creatures and plants. It has been licensed for English language release in North America by Kodansha USA.
Plot Akira Sengoku and his classmates are flying back to Japan from their school trip to Guam, along with other classes from their school and various passengers. Their trip, however, takes an unexpected turn when their plane hits turbulence and crashes on a Pacific island. After recovering from being unconscious, Akira learns from his friends that they are on a mysterious island filled with extinct prehistoric creatures and plants. With nowhere to go, Akira leads a small group of survivors to find others like them. They search for a way to get home, fighting off the island's savage creatures and encountering other survivors who have gone mad. Along the way, they will discover the mysteries and secrets of the island, all whilst struggling to survive there.
Characters Main characters
Akira is a mischievous and lecherous troublemaker, considered the class delinquent. He struggles with deep-seated insecurities over his poor grades and lack of success. On the island, he demonstrates exceptional initiative and insight, gradually developing latent leadership qualities through encounters with Yarai and Ernest (Dire Wolf). He exhibits surprising physical prowess in critical moments, aided by his endurance. Unintentionally attracting the affections of several women, he becomes viewed as a natural-born playboy by his childhood friend Rion, causing her jealousy.
Rion is Akira's childhood friend and the school's idol, serving as the star of its gymnastics team. She possesses notable physical flexibility, which allows her to attack from unexpected angles. Bighearted and quick-witted, she has long held feelings for Akira and habitually looks after him, though she refuses to admit her affection. Following the crash, she initially hides from the chaos before Akira finds her; she subsequently remains with his group. She frequently joins smaller reconnaissance teams and often becomes jealous when other women show interest in Akira.
A teenage prodigy, Shirou possesses an encyclopedic knowledge of prehistoric fauna and flora, which he accesses from his laptop. He was ranked first in his class for nine consecutive years and serves as the group's primary strategist and Sengoku's second-in-command. Highly logical, he often suppresses his emotions to maintain rationality, a stoicism that masks inner pain and previously resulted in few friendships. After a confrontation with Zaji, he resolves to discard this emotional mask and value his companions more openly.
Kouhei is Akira's best friend. Initially bullied, he gained popularity after Sengoku defended him, eventually becoming the star of the volleyball team. He tries to maintain morale among the survivors but snaps upon learning they cannot return home, killing the pilot in a rage. Plagued by guilt over this act and later a head injury, he descends into murderous paranoia, killing survivors and driving others to insanity. After a confrontation with Sengoku, he regrets his actions and aids the group's escape from a flooding cave, staying behind and is presumed dead. In truth, he survives and leaves to atone for his crimes, with only Yuki and Hades aware he is still alive.
An air stewardess who joins Akira's group. She is very knowledgeable in first aid, although she is also quite clumsy. She has low self-confidence, but only has pride in her large bust. While at first she was easily scared, even from the harmless Ptilodus (who are revealed to actually like her), eventually she becomes courageous, going as far as taking a stab from Kouhei. She grew to be rather close to Zaji and took her some time to overcome his death.
Kurusu is a loner well-known for his violent tendencies and is the most formidable fighter in the series, possessing significant intelligence and advanced scientific knowledge. Primarily focused on unraveling the island's mysteries, he considers Sengoku his first genuine friend. His troubled past, marked by parental neglect and the deaths of his mother and aunt, shaped his solitary and aggressive nature. He harbors deep feelings for Kurusu, demonstrated when he nearly murders Akira under duress to save her. Following her recovery, he carries her constantly. He eventually overcomes his profound depression through his connection with Mami.
A tanned teenager. He comes from a broken family, where everyone ignores him. He does not do well in school, and has no friends his age. While perverted, Kazuma has a strong loyalty to his friends whom he considers like his own family. During the series, he begins to fall for Oomori, but is rejected when he finally confesses. Soon after, he gets injured during a fight with some of the island's animals. Realizing he is dying, he chooses to fall off a cliff in order to not make Oomori suffer emotionally, nor to become a burden to the rest of the group, making the entire group depressed over his death.
Sengoku's group
Class President of Sengoku's class and a member of his group. She was originally a part of Kouhei Arita's group and is the only remaining survivor of the group, besides himself. She is very intelligent and is known for giving out various historic facts. She likes bears and has an interest in premonitions. She has a crush on Sengoku, but decides not to tell him since she knows he likes Rion.
A mischievous, cross-dressing boy who disguises himself as Miina Isurugi, the granddaughter of billionaire Yoshimi Isurugi and heir to the Isurugi Conglomerate. Despite being a boy, everyone usually refers to him as "she" or "her". Akira and his group first meet "her" after being brought to "her" camp, where she rules a group of defenseless men with three Yakuza gangsters as her bodyguards and enforcers. In truth, Miina is using the Yakuza not to rule the camp but to protect "herself" as Miina had witnessed the men in "her" camp rape and accidentally killed a woman named Towa, an air stewardess and colleague of Kanako. Although small, Miina is depicted as a smart and strong character who uses "her" natural abilities as a lolita to manipulate others. His real name is Heijirou(平治郎, Heijirou).
A mysterious girl, the real granddaughter and heir of the billionaire Isurugi. She claims to have amnesia. She carries around a sketchbook with extremely accurate depictions of the island's wildlife and knows the details of their physiology. The fake Miina's appearance is very similar to hers, although her hair color is dark. Her name is carved on a tower in the center of the island. It is speculated that she develops feelings for Heijirou, her body double, since "she" saved her on multiple occasions.
An intellectual individual who was also the student school council president for two years in a row. He was the leader of his own group before meeting Sengoku Akira and had effectively created a small base before meeting with Sengoku's Group. Yamaguchi has a lot of charisma considering he easily got a large group to follow his plan to create a school within their situation. He seems to have feelings for Yuki.
Miyauchi is a skilled warrior who trained in a dojo from a young age and holds a second-dan black belt in karate. A confident and powerful fighter, she can smash targets with her kicks and possesses precise control over her movements. Her abilities make her a valuable combatant against both human and beastly threats. She is the childhood friend of the late Zaji Kazuma, whose death greatly upsets her. Despite her prowess, she finds opponents that can shrug off her attacks difficult and holds a particular terror of insects.
A 20-year-old college student, Rei is a tomboy with an upbeat and caring personality. She often wears a bikini top, jacket, and mini shorts. She is highly perverted and prone to giving other girls mischievous, false advice. Having attended the same high school as most of the main cast, she is traveling with her friends Kotomi and Tooru. Her concern for the isolated Miina (Fake) stems from her close relationship with her own younger brother, who underwent a similar experience.
A 20-year-old college student and Rei's childhood friend, he is an open and friendly individual who prioritizes the group's well-being and addresses problems frankly. He remains consistently protective of Rei. His face was scarred by an Arctodus, leading him to conceal it with bandages until Kotomi's death.
A high school student with clairvoyant abilities, she can predict events in the near future. Shy and not from the main group's school, her original leaders used her powers deceptively, killing members of Akira's group to validate false predictions. After a genuine premonition was dismissed, her group was killed by pristichampsus; Akira saved her from the same fate. She now experiences occasional, uncertain premonitions about the surviving cast.
The younger twin brother of Airi, whom he has a very deep connection. He has a lot of knowledge about dark stories. He accompanies Sengoku in his mission to the pyramid.
The older twin sister of Kairi, whom she has a very deep connection, to the point of knowing the exact spot where her other twin is.
A perverted and lecherous student, he frequently attempts to manipulate others. He possesses incredible luck, which consistently results in his assignment to dangerous missions or roles as decoy or bait during animal attacks. The girls dislike him for his behavior, and Akira distrusts him completely following his attempted assault on Rion.
A former member of Yamaguchi's group, she was the vice president of the school student council and possesses an eidetic memory, granting her near-perfect recall. She accompanies Akira on the mission to the pyramid, where her observations are instrumental in helping the group eventually solve the island's mysteries.
A former kendo club member and Momoka Kirino's childhood friend, he possesses skill with a blade but struggles with a deep inferiority complex. He once abandons Akira to a Gigantopithecus, an act for which Sengoku punches him but ultimately forgives. He dies protecting Asuka Takahashi from a smilodon.
A former member of the Kendo club and Shuu's childhood friend, who was also kidnapped by the Gigantopithecus and watched one of her friends die at the hands of the giant ape. She comes to resent Asuka for surviving instead of Shuu, but she eventually forgives her.
A hardworking member of the group, her primary notable skill is singing. While accompanying Shuu to gather water, they are attacked by a smilodon; he sacrifices himself to save her. Following the tragedy, she helps lift the group's spirits with her song.
Morita's group
Known as Eiken, he one of Akira Sengoku's closest classmates and an aspiring photographer. A short boy whose bangs perpetually obscure his eyes, he survives on the island through the support of those around him.
An extremely athletic and stoic individual, she is the first to begin traveling with Makoto. A former track and field club member, she is a strong and effective fighter who hates to lose. She speaks very little and shows no remorse in combat. Her sole weak point is her lower back, and she once threatened to kill Ryouichi if he touched it again.
A perverted lolicon who was forced by his parents to take on the ways of a monk because of a scandal when he worked at the City Council. Despite his pervertedness, he has useful skills and can also give good advice.
The oldest person in Makoto's group, who's rather slothful and unhelpful to the group since he was a rather successful business man and had a lot of workers working under him.