Koko is one of the main protagonists of the anime Nanashi Kaidan. He is a boy of elementary school age, distinguished by his short blonde hair and bright blue eyes, and his wardrobe is notably flashier than those of his classmates. Alongside his close friend and partner Bon, and often spurred by the unsettling tales of the mysterious Mukuroji, Koko actively investigates and confronts supernatural phenomena. His primary motivation is to protect others by sealing away the threats that emerge from these ghost stories. Koko is characterized by his bravery and proactive nature, frequently stepping in to rescue classmates who have fallen victim to paranormal occurrences. He is well-liked among his peers and demonstrates a strong drive to do what is right. In direct confrontation with the supernatural, Koko has shown a remarkable ability to vanquish spirits, once defeating an impostor entity by forcefully asserting the truth of his own identity, suggesting that willpower and conviction are powerful tools against the unknown. His most significant relationship is with Bon, forming an effective duo dedicated to resolving the eerie situations that plague their community. Mukuroji serves as the enigmatic catalyst for their adventures, with his stories providing the context for the threats they must face. Throughout the series, Koko consistently acts as a courageous and reliable force against the supernatural, growing more experienced with each encounter.