Anna goes to Makoto Mirai Academy, Mikuru’s school, to give Mikuru an umbrella, but then she meets a troubled woman named Mariko who is looking for her little sister Keiko. Meanwhile, Mikuru is asked by the school’s Chairwoman to solve a case involving a ghost in the high school.
Anna transfers to Mikuru's class at Makoto Mirai Academy. While surprised at the size of the campus, she and Mikuru find themselves lost in a puzzle maze created by Goemon.
