The grandson of the famous private detective Kosuke Kindaichi. A 2nd-year student at Fudo High and a member of the Mystery Research Club. While he struggles with schoolwork, he is actually a genius with an IQ of 180. Usually, he is lazy and goofy, but when solving a mystery or cornering a culprit, he transforms into a sharp and fearless investigator. He has a habit of scratching the back of his neck when thinking. He reunited with his childhood friend Miyuki after 12 years when he transferred schools. He is characterized by short black hair with neatly styled sideburns. First person: I (casual/rough). He speaks in a somewhat childish manner and addresses everyone except his seniors without honorifics. He is handsome but a bit of a pervert.

A 2nd-year student at Fudo High and a member of the Mystery Research Club. She has a dignified, mature personality and is the idol of the school as a beautiful girl who excels in both academics and sports. While she acts ladylike at school, she is naturally a festive, big-sister type who lets loose when around people who know her true self. She calls Hajime "Hajime-chan." She has a slender, attractive build and a cute personality. She harbors romantic feelings for Hajime. Her hair is a brown, wavy lob. She once suffered a serious injury after being struck with a blunt object by the "After-School Magician," but has since recovered. She addresses everyone except Hajime with -kun, -chan, or -san.

A 1st-year student at Fudo High and a member of the Mystery Research Club. A total video geek. He films with his video camera everywhere he goes, and his eccentric habit has occasionally provided the key evidence to solve a case. He has brown hair. As the junior of the group, he addresses everyone as "Senpai," while he uses -kun for those younger than him.

Wears round glasses. A 2nd-year student at Fudo High and a member of the Mystery Research Club. Originally having a dark and devious personality, he has softened into a more friendly person and now maintains a good relationship with Hajime. He is highly intelligent and a popular mystery novelist, though he uses a ghostwriter. He addresses everyone except his seniors without honorifics.

A 3rd-year student at Fudo High and the president of the Mystery Research Club. She is the one who recruited Hajime into the club. She is a beauty with mid-length brown hair. In the original story, she was killed by the "After-School Magician" after discovering bones hidden inside a wall, but here she is alive and well. She addresses everyone using -kun or -san.