Yukari Uehara belongs to the Uehara family, who discover and adopt Coo, a displaced kappa from another era. Though initially astonished by the creature’s sudden appearance, she swiftly integrates him into their household alongside her husband and children. Her responsibilities pivot on balancing everyday family life with the peculiar challenges of coexisting with a mythical being—guiding her children’s curiosity, rearranging domestic routines, and adapting their suburban home to accommodate Coo’s needs.

When media scrutiny intensifies around his existence, Yukari collaborates with her husband to shield their family from public intrusion. She supports strategic decisions to protect Coo’s privacy, including a measured appearance on a televised talk show aimed at tempering external speculation and pressure.

Her dynamic with Coo reveals pragmatic empathy, particularly as he contends with unresolved trauma from his past. She fosters a stable, nurturing atmosphere for his emotional recovery even as external tensions rise. The family’s eventual acknowledgment of Coo’s need to depart underscores her resolve to prioritize his autonomy over their familial bonds, reflecting her pivotal role in nurturing a transient yet deeply impactful kinship.