Isogai

磯貝

The elderly neighbor of the Furukawas. Although she does not make her debut until Two Shadows, her name is mentioned as early as The Scenery With a Carving, when Fuko coincidentally chose her surname as her alias. She later appears in a cameo in Two Shadows, attending the school festival and watching Nagisa's play alongside Sanae.
In the ~After Story~ episode Disagreeing Hearts, a disguised Sanae uses the alias Sanako Isogai while pretending to be Youhei's girlfriend. In The Promised Founder's Festival, the real Isogai tells Tomoya that the neighborhood finds it entertaining to see Akio and Sanae running out of the store.