Sachiyo Matsuda is the landlady of Matsuda Heights, an apartment complex in Tachikawa, Tokyo. She manages the residence where Jesus and Buddha live during their vacation and enforces a strict set of rules printed on the complex's fence. Her appearance features short brown hair, visible wrinkles, and a distinctive beauty mark beneath her right eye.

Her personality is stern, straightforward, and busybody-like, maintaining a crabby demeanor. She vigilantly watches tenants for rule violations. Despite this strictness, she possesses a kindhearted side and occasionally makes exceptions for considerate individuals, fitting the "Jerk with a Heart of Gold" archetype.

She regularly interacts with Jesus and Buddha, bringing them home-cooked meals and checking on their well-being. She consistently misinterprets their unusual behaviors, such as accidental miracles or glowing halos, attributing them to plausible mundane explanations instead of their divine natures, often scolding them for perceived eccentricities.

Her prominent appearances occur in Chapters 5, 10, 17, 20, and 27 of the original manga. Her role consistently involves managing the apartment complex and reacting to the saints' activities. No significant character development or expanded background story is documented in other official media like the OVA or film adaptation. Her role remains focused on her duties as a landlady and her interactions with the main tenants. The available information does not detail her family history, personal life beyond apartment management, or character arc evolution; her role is confined to comedic misunderstandings and maintaining order at Matsuda Heights.