Ép. 4: Souichi et Kousuke rencontrent des parachutistes tandis que Kousuke tue son père et affronte Ryouta.

In a flashback, the police arrive at a crime scene where they arrest 14-year old Kōsuke Kira, a sadistic necrophilliac who had murdered three women. Back in the present, Souichi Natsume discovers Kousuke near the shore, skewering frogs for fun. Souichi tries to explain the difference between killing living things because it is wrong and killing out of amusement however Kousuke rejects the explanation. At the same time they witness parachute drops and go to investigate together with Kousuke's father, Yoshihisa Kira. Another flashback reveals that Kousuke was horribly absused by his father as a boy and hence has no qualms about hurting others. Back in the present, Yoshihisa forces Kousuke use his bombs to retrieve the supply case from a tree which he does. Yoshihisa then takes the case for himself but after Souichi says they should share the contents, Yoshihisa refuses saying that in the jungle it is survival of the fittest. Kousuke then activates one of his bombs and kills Yoshihisa whilst feeling a rush of euphoria. Frightened, Souichi runs away saying Kousuke is akin to a monster. At this point, he is discovered by Ryouta and Kiyoshi, who try to reason with him but to no avail, hence they retreat. Kousuke, goes after them with intent to kill and Ryouta decides to fight in order to protect Kiyoshi. However he cannot bring himself to kill another person. They soon recognize each other as Btooom! players and engage. Ryouta is soon pushed back but hits his head against a rock which causes a personality shift where he perceives reality as being the game world and is able to defeat Kousuke by hiding his movements with advanced sonar cancelling. Ryouta then comes to his senses after he realizes the devastation he caused and cannot bring himself to kill the unconscious Kousuke, instead binding him to a tree and taking the supplies and his BIMs. Kousuke demands to know Ryouta's name and is thrilled to learn Ryouta is actually the top ranked Japanese player of Btooom!. (Source: Wikipedia)

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