Shirosaki and Momoichi are separated from Gero and the others. In the forest, the two find the headquarters of the "Beast Tamer" and, upon entering the laboratory, witness Jushiro conducting experiments with blood test tubes in his hand. Momoichi engages in a fierce battle with Byakko, a hybrid beast created by Jushiro, but is put in an unprecedented predicament by Byakko's immense power, which has incorporated the blood of Gero and Momoichi as well. Gero, who is once again confronted by Jushiro, suffers an overdose from "Toxin Triple." Meanwhile, Arashiyama, whose life is in danger, grits his teeth and summons all his strength to take action.

The fate of Jushiro and the white fox is entrusted to Dogo Jushiko, the head of the "Beast Tamer" family. Meanwhile, Arashiyama holds the "Animal Thanksgiving Festival" to express his gratitude to Gero and the others. Gero finds Arashiyama's way of life truly admirable. Shirosaki, not wanting to miss this chance for romance between the two, activates her love-assist skills! What will become of Arashiyama and Gero's love...? Gero's search for a wife accelerates after meeting Himekawa, Ureshino, and Arashiyama. At the same time, Gero Teruaki, a member of a branch family of the "Poison Tamer" Gero clan, seems to be making some ominous moves...