Mama Nagataki works alongside Akari Taiyo at the fortune-telling shop, previously owned by Akari's late mother, Hinata Taiyo. This connection roots her role in the protagonist's family history. She operates the establishment as part of a team that includes Lymro and Hanayume. Her position places her in regular proximity to Akari's daily activities within the shop's fortune-telling operations.

Information about Mama Nagataki's personal background, family connections, character development, or involvement in the central conflicts against Daemonia is unavailable. Her documented interactions with main characters occur solely within their shared professional capacity at the shop. Details regarding her appearance in other media formats, significance beyond her occupational role, story arcs, evolution, or expanded background remain unspecified.