Allen, a misanthropic wizard, lives deep within the forest. He is known as the "Demon Lord" and feared by those around him. One day, while living his life as a hermit, he comes across a young girl named Charlotte who has collapsed in the forest. Despite being innocent, she was accused of evil deeds, had her engagement annulled, and was forced to flee her country. When he heard that, Allen remembered the agony of being betrayed by a group he once thought was his companions. After hearing the story of the 17-year-old's exploitation, Allen decides, "I'll let her live in my mansion, and I'll teach her all sorts of bad things..."

Everything has been going according to plan, but the hour of awakening draws near. Cid Kageno and Shadow Garden investigate the Lawless City, a cesspool where the red moon hangs low in the sky and three powerful monarchs rule the streets. The true draw for Cid, however, is one who can draw blood–the Blood Queen, a vampire who has slumbered in her coffin for eons. Her awakening approaches, and Cid could finally face a day of reckoning.

Fuuta-kun has never owned a cat before, but his younger sister, Pii-chan, moves into his house with the round gray cat Kyuruga. Inexperienced with cats, Fuuta-kun has no idea what to expect, and each night after he returns home is marked by odd and endearing surprises from his new pet.

Years ago, astronaut Byakuya left behind precious materials in the belief that his son, the scientifically-gifted Senkuu, would one day find them. In the present, the Kingdom of Science's Kohaku and Ginrou have infiltrated the harem of the Petrification Kingdom’s leader with the help of Amaryllis, a local girl. At first, their mission progresses without a hitch. Unfortunately, an error enacted by Kohaku and Ginrou leads Minister Ibara and the Island’s strongest warrior, Moz, to identify the intruding duo as enemies. Even worse, Moz tails Amaryllis when she returns to inform Senkuu of the news, discovering the scientist's secret hideout. However, Moz's agenda does not align with Ibara's—he wants to dethrone the minister and keep the petrification device for himself. If Senkuu plays his cards right, he could gain a powerful ally and win the war once and for all.