4. Bölüm: Rentaro, Kagetane ile savaşır ve Beşinci Aşama Gastrea'ya Cennet Merdiveni raygununu ateşler.

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Rentaro and Enju head into the bay area while Kayo stays behind to defend the area from the looming Gastrea. Discovering that all of the other civil officers had been gruesomely slaughtered, Kagetane and Kohina make a stand before the pair. Rentaro charges at Kagetane and breaks through the latter's Varanium barrier with his own Varanium prosthetic limbs. Kagetane then urges Rentaro to join him in starting another Gastrea War. However Rentaro refuses and Kagetane blows a hole through his abdomen. On the verge of death, Rentaro uses Sumire's experimental AGV drug to successfully regenerate his body and then uses his Varanium-enhanced martial arts to viciously defeat Kagetane. Afterwards a Stage Five Gastrea appears outside the Tokyo Area, and Kisara has Rentaro activate the Heaven's Ladder railgun. Unfortunately, various errors force Rentaro to use his own left Varanium arm as a projectile and manually fire the weapon; successfully destroying the Gastrea. In the aftermath, Rentaro discovers Kayo on the verge of death after defending the area for his sake and ends her life coup de grâce. Later, Rentaro accuses Kikunojo Tendo of being the mastermind behind Kagetane's actions. In the epilogue, Rentaro questions Seitenshi on the origins of the Gastrea however she refuses to disclose any information. Afterwards Rentaro gives Enju the results of her Gastrea corrosion examination which appear normal. Unbeknownst to Enju though, her rate of corrosion far exceeds what Rentaro told her. (Source: Wikipedia)