The central protagonist, a kappa swallowed by the earth two centuries ago and rediscovered in modern Tokyo. He integrates into the Uehara family, uncovers the truth about his murdered father's severed arm, and ultimately embarks on a journey to Okinawa to find his kind and honor his legacy.
Direct biological parent whose tragic fate establishes Coo's origin.
Explore the full interactive character relationship map of Summer Days with Coo