Sakuya Lansaihe operates as a member of the Meltylancer unit, a specialized six-woman team within the Galaxy Police Organization. This unit, previously disbanded, was reassembled by Commander Collins to counter an emerging threat.

Her background identifies her as a priestess of the Church of St. Archanest. She maintains a soft-spoken and optimistic demeanor, providing a contrast to her more assertive teammates. This personality reflects her religious role, emphasizing serenity and positivity during the team's operations.

She possesses psychic powers, though their specific manifestations and applications remain undefined. Her physical appearance features blue hair, typically worn in a ponytail.

Within the Meltylancer unit's activities, Sakuya participates in investigations targeting criminal entities like the terrorist group Defiant and the Vanessars, all connected to the enigmatic "Iyonesco." The unit confronts diverse challenges, including space-collapsing weaponry, internal GPO conspiracies, and encounters with beings such as a genetically engineered beast-boy and a computer-based entity.

Her involvement is integral to the unit's collective effort against these overarching threats.