The Testament of Sister New Devil Storm!

あらすじ

Toujo Basara's life changes dramatically when his father announces he is remarrying. Basara gains two new stepsisters, Mio Naruse and Maria Naruse, who are not only beautiful but also members of a demon clan. Mio is a Demon Lord, and Maria is her succubus servant. As Basara navigates this new family dynamic, he finds himself in a chaotic situation, needing to protect his demonic stepsisters from dangerous rivals while also dealing with their lusty appetites.