"Youjuu Kyoushitsu Episode 6," also known as "Demon Beast Invasion," concludes the intense saga of Muneto Ungyōsai and Kayō Asakura as they confront the ultimate demon beast threat. In this climactic episode, the demon beast, having taken on a formidable form, seeks to finalize its plan of creating a human-alien hybrid race to dominate Earth. Muneto and Kayō, with the aid of the Interplanetary Mutual Observation Agency, engage in a desperate battle to thwart the creature's ambitions. The episode masterfully blends horror and science fiction elements, delivering a suspenseful narrative that keeps viewers engaged. The animation, characteristic of early 1990s style, effectively portrays the dark and eerie atmosphere of the series. "Youjuu Kyoushitsu Episode 6" serves as a fitting conclusion to the series, encapsulating its themes of survival, courage, and the resilience of humanity against otherworldly threats.