On a weekday evening, Tago, a college student living alone, realizes he forgot to buy soy sauce and visits his neighbor, married woman Saki, to ask for some. "Ah, sorry about this, I completely spaced out... If you ever need anything, please don't hesitate to ask me too!" he says awkwardly, making his request. This simple phrase sparks something inside Saki, a sexually frustrated and sensitive woman, igniting her intense desires. This small, everyday incident becomes the turning point that drastically changes their relationship.