The title leans heavily into parody and ecchi comedy, mixing supernatural fantasy (angels vs. demons) with absurd, adult-oriented challenges. The humor likely comes from the contrast between divine/pure imagery and the very physical, lewd nature of the contest.
The story takes place in a world where music has the power to create and control beings known as "Echoes." These Echoes can take on various forms, from angelic creatures to demonic entities, and are born from the emotions and thoughts of humans. The narrative follows the journey of a young protagonist named Hana, who possesses a unique gift – the ability to create and control Echoes through music. Nuki Doki- -Tenshi to Akuma no Sakusei Battle-