Hiro loses consciousness while shopping and is taken to the hospital. He wakes up there only to be chased by a mad scientist named Housei Sanagida and his minions, interested in his immortality. Hiro tries to find a way out of the hospital while his energy gradually depletes. Hime, Flandre, and Riza, who are all aware that Hiro needs restoration, go out and search for him at night. Reiri tells the three that Hiro is at the hospital. Sanagida takes Hiro to the operating room, preparing himself to dissect Hiro. Hime, Flandre, and Riza push their way past the minions to get to Sanagida and rescue Hiro. When Sanagida charges at Hime, she electrocutes him to death using a defibrillator.

During the day, Hime tells Hiro to congratulate Sherwood for her arrival at her new mansion. Upon reaching there, Hiro sees Francisca carrying a panda, which she names Ryu-ryu. Sherwood allows Ryu-ryu to work for her, seeing if he can make himself useful around the mansion, but all he does is cause more harm than good. At night, Reiri shows up at that mansion and warns them that a colony of spiderbats will soon attack them all. During the battle, Ryu-ryu takes a hit to protect Sherwood from being hurt. Soon after, Hime and Riza come to help defeat these spiderbats by sunrise. Sherwood and Francisca find out that Ryu-ryu was knocked out, not killed.