About three months after the last incident, Haruko takes some of her class to the beach. Hidomi finds herself dragged along with Jinyu, who insists on keeping her from Haruko. Meanwhile, calling Goro's bluff of having a girlfriend, Ide and Marco meet a shy girl with flowerpot named Aiko. As Jinyu and Haruko talk about their goals, the kids enjoy their time on the beach, playing volleyball and building a sandcastle. Despite agreeing to a momentarily ceasefire with Jinyu, Haruko buries her under sand and cement before abducting Hidomi before anyone can notice they are missing. As Marco uncovers that Goro is actually paying Aiko and is given her potted plant, Ide, having realized Hidomi is gone, finds her in a crumbling, dilapidated Medical Mechanica factory on an operating table, where Haruko is trying to make her overflow. Seeing Hidomi's half-naked body causes Ide to overflow instead, and a giant blob monster erupts from his forehead. During the ensuing battle, Hidomi accidentally kisses Ide's chest, causing a large floating junk pile to emerge from her body. With Jinyu's help, Ide frees Hidomi, but Haruko convinces him to try to remove Hidomi's headphones. When he touches them, the headphones' security protocol activates, screwing them into the sides of Hidomi's head as the pile of junk falls back to Earth. Reluctantly, Haruko opts to team up with Jinyu to take the fight to the headphones' creators: Medical Mechanica.