Renjo, Kyuu

連城究

A bright, sweet, and optimistic boy who is also a precocious detective. In real life, he frequently says the wrong things and embarrasses himself. Otherwise, he is regarded as the team's leader and is known for his logical explanations of cases. He possesses a good sense of judgment regarding people (when everyone distrusted Ryu, he expressed open appreciation for him), but he often says things that infuriate Megumi.
Kyuu had been an only child of a single parent (his mother) for as long as he could remember. He did not have a father, but there was a certain man who had acted as his mentor when he was little. When he was six years old, he was kidnapped and held hostage by some criminals, but his mentor rescued him. In reality, this man was none other than Kyu's father (Satoru Renjo, Morihiko Dan's very best partner). Realizing the high risk of being a detective, Satoru formerly married Kyu's mother in secret to keep his new family safe. After Renjou's death, Kyu's mother hid the truth from Kyu for years, trying to shield him from the danger that the life of a detective always entails; after he was accepted into the DDS, Mrs. Renjou changed her mind and supported him fully.