Toujo Basara, a student in high school, experiences a peculiar change in his life. Despite feeling uncertain about his father's impulsive choice to remarry, Basara acknowledges that there are a few advantages, including his striking new step-sisters. However, these alluring girls are more than just ordinary siblings - they belong to a clan of demons. Mio Naruse is the Demon Lord, while Maria Naruse serves as her succubus. As Basara becomes familiar with his demonic relatives, he has to safeguard them from vicious demon adversaries and struggles to keep pace with their passionate and devilish hunger, resulting in chaos and thrilling escapades.
