Washiho Usuki 臼杵鷲帆

A geography teacher and the homeroom teacher for Mike's class; in his late twenties.

He became a teacher out of an interest in the school's origins and a desire to investigate them. Consequently, he frequently conducts archaeological excavations on the school grounds—sometimes even teaching class while his lab coat is caked in mud. He believes in fostering student autonomy, so he generally takes a hands-off approach with both his class and the Archaeology Club.

He established the Archaeology Club primarily to secure manpower for his excavations, so he forcibly summons members whenever a large-scale dig is underway.