Mash Burnedead and the Puppet Master (S01E07)

Mash beats Silva, defeats the giant forest scorpion, and successfully completes the joint extracurricular activity. The five silver coins collected become one gold coin, and Mash learns about the existence of Lang Dorm's core students who hunt coins - the seven students of the Magia Lupus. But later, Mash, searching for his next classroom, wanders into the Magia Lupus stronghold. Although he makes it out alive, a black shadow approaches Mash and his friends while cleaning out the owl huts.... (Crunchyroll)