Plantation 13 links up with Plantation 26 in order to transfer much needed magma fuel. However, the process is sure to attract klaxosaurs, requiring the Franxx pilots of both Plantations to work together. Meanwhile, Hiro becomes an accepted member of the squad but Goro notices that Hiro's health has been declining significantly, with a blue tumor-like growth growing on his chest ever since he rode with Zero Two. Hiro manages to convince Goro to keep quiet about his condition...