Two months after the Scorched Halloween incident, Tatsuya and his friends hold a going-away party for Shizuku who will be studying abroad in America. With the start of the new semester, an exchange student from America arrives at First High School.

A string of bizarre murders occurred where the victims were found to have most of the blood drawn from their bodies. Due to the methods used by the killer, they were called "vampire incidents," and similar incidents were also occurring in America.

The vampire that attacked Leo was a demon called a "parasite." The Saegusa and Jumonji families decide to join forces to solve this case. Mikihiko and Erika search for the parasite to get revenge for Leo, and they confront a mysterious masked magician.

It turns out that the masked magician that engaged in a sword fight with Erika was Lina. With her identity blown, Lina uses the Parade spell to attack Tatsuya. Tatsuya attempts to disable the Parade spell by dismantling it but fails.

A parasite is an information body that was generated from the spirit dimension. How could an entity from another dimension appear in the physical world? An evil visitor of unknown origin infiltrates its way into First High School.

Valentine's Day is a day to gift chocolate to the one you love and confess your feelings. This tradition is a source of joy and grief for many even at a distinguished institution like Magic High School. What will happen this year on Valentine's Day?