Yasuo Uehara, husband to Yukari and father of the Uehara family, balances pragmatism with steadfast support as the household navigates sheltering Coo, a rediscovered kappa. His curiosity about folklore and mythology intertwines with a sense of duty, prompting him to initially conceal Coo’s presence to shield the family from outside interference. When media scrutiny intensifies, Yasuo orchestrates a measured response, releasing a video of Coo to appease public interest and deter invasive press around their home—a move highlighting his practical mindset and dedication to safeguarding their privacy.

Calm and observant, he mediates between his son Koichi’s exuberance and daughter Hitomi’s hesitance, maintaining equilibrium in family dynamics. His playful rapport with Coo emerges during lighthearted sumo-wrestling bouts, revealing adaptability to the extraordinary. As Coo’s departure looms, Yasuo coordinates a plan to distract paparazzi, ensuring a quiet farewell that honors both the kappa’s safety and the family’s emotional needs. Through each challenge, he anchors the household with quiet resolve, embodying stability amid the surreal.