A gentle girl who is an expert in Japanese literature. She hates injustice. A member of Detective Team KZ. 16 years old. Excels in language arts. Attends the same cram school as the others.

The attention-seeking leader of Detective Team KZ. 16 years old. Excels in law. Attends the same cram school as the others. Very prideful. Has a complex about his short height. Known as "Wakatake of the Waves" because his test scores fluctuate wildly. A celebrity at the cram school. Attends the same cram school as the others.

A serious-minded math expert. Stubborn and prideful. 16 years old. Excels in mathematics. Known as "Uesugi of Math" because he always ranks first in the subject. A celebrity at the cram school. A member of Detective Team KZ. Attends the same cram school as the others.

A smooth talker who knows how to handle women. He has a mature and calm aura. 16 years old. An expert in interpersonal relations. Rumored to have connections with the police and lawyers. A member of Detective Team KZ. Attends the same cram school as the others.

An expert in social studies and science with a gentle, timid personality. A member of Detective Team KZ. Known as "Kozuka of Shari" (Social/Science) for his expertise. A celebrity at the cram school. 16 years old. Attends the same cram school as the others.

Has an incredible sense of smell, picking up scents others can't. Possesses angelic good looks. A member of Detective Team KZ. Has a bit of a mischievous side. A high-scoring all-rounder, particularly strong in history. Attends the same cram school as the others. 16 years old.

A computer expert. Capable of hacking. Has long hair and looks like a girl, but is a boy. Possesses spiritual powers and is a medium. The eldest son of the Nanaki family. A member of Detective Team KZ. 16 years old.