Kaibutsu Oujo S01E07 - Princess Lightning

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.