Asumi Fūrin emerged from a fragment of Nodoka Hanadera's dream, a piece given physical form and consciousness after being separated and empowered by a Mega Byogen's negative energy. Initially manifesting with Nodoka's appearance and memories, the entity believed itself to be the real Nodoka.

Its existence depended on the negative energy that sustained it, and its primary instinct drove it to seek out and merge with the original Nodoka to achieve completeness. This imperative brought it into direct conflict with the Healin' Good Precure team.

During the confrontation, the copy faced a profound identity crisis upon realizing it was not the real Nodoka. This revelation, combined with Nodoka's compassion and refusal to engage in battle, triggered a fundamental change. The negative energy purged away, and the copy was reborn as a distinct individual who chose the name Asumi Fūrin.

As a new being, Asumi possesses a gentle and curious nature. She retains a deep, empathetic bond with Nodoka, often sensing her emotions. She expresses a desire to protect the dreams of all people.

She gains the ability to transform into Cure Earth, a form associated with the earth and the power of dreams. Her transformation device is the Earth Heal Bottle. Her attacks include "Dream Healing!", which purifies enemies with dream energy, and "Earth Healing!", which utilizes the power of the earth.

Her purpose becomes the protection of the dream world. After the conflict's resolution, she cannot remain in the waking world as a being born from dreams. She chooses to stay within the dream world as its guardian, watching over the dreams of all living things while maintaining her spiritual connection to Nodoka.