Risara Restole, alternately documented as Lisara Restall or Risara Restole, originates as a Shinigami realm Goddess of Death. Her core mission in the human world centers on locating "The Singular Man," driving her narrative involvement. During this pursuit, she encounters human high school student Ryosuke Kaga in rainy conditions outside his residence. To sustain her presence in the human dimension, she establishes a temporary contract with him, drawing energy specifically from his lecherous spirit rather than his lifespan. This energy source renders Ryosuke incapable of maintaining perverse thoughts or engaging with sexual content.

Initially, Risara exhibits a stern, duty-bound, and professional demeanor befitting her elite Grim Reaper status. Her early interactions with Ryosuke involve consistent friction due to his diminished libido and their clashing priorities, emphasizing mission focus over interpersonal connections through displays of impatience and harshness.

Records identify familial ties: a daughter sharing her full name, Lisara Restall, and a niece named Quele Sellier.

As their partnership progresses, Risara's characterization reveals greater complexity. While unwavering in her Shinigami duties, her interactions with Ryosuke gradually unveil underlying concern and protectiveness. This evolution culminates in later narrative segments through mutual reliance. Her initially transactional contract subtly shifts toward a more invested relationship, intertwining their fates and hinting at latent emotional dimensions beneath her disciplined exterior.

The contract necessitates Ryosuke's active support of her mission to preserve his own life, further complicating their association. This interdependency recurs throughout, juxtaposing her Death Goddess authority against her growing, albeit reluctant, vulnerability through sustained human exposure.