The Irregular at Magic High School (2014)

S2E3 Visitor Arc III

The creature that assaulted Leo was known as a "parasite," a type of demon. In response, the Saegusa and Jumonji families choose to collaborate in order to tackle the situation. Mikihiko and Erika are determined to hunt down the parasite and seek vengeance for Leo, leading them to face off against an enigmatic masked magician.