Source material advertisement, or perhaps an attempt to gauge demand for a anime adaption of the source material.
Hyouta has an crush on Anzu, but Memumemu is a weak demon girl after Hyouta's soul. Will Hyouta manage to confess his feelings for Anzu? Why does Memumemu want Hyouta's soul? If you want answers to these questions and more, go read the manga. No, literally.