Tsuzumi, a 37-year-old salaryman working as a manager in the editorial department of a literary magazine, leads a disciplined life and avoids drinking after work. One night while returning home late, he is called out by Kuroda, a mysterious and beautiful woman known as a heavy drinker. She forcefully invites him for a drink, and what follows is a series of encounters set at the hour of ten at night, when the first round of drinking has ended and the streets grow quiet. Each chapter revolves around the pair sharing a late-night feast at various bars and eateries, pairing fine wine, beer, sake, and cocktails with carefully chosen dishes. The story explores the evolving accomplice-like relationship between the two, built on the thrill of guilt and the pleasure of food shared outside the bounds of ordinary routine. Notable narrative arcs include their first meeting, a trip to a standing bar, and themed meals such as nostalgic croquettes, spicy awakening dishes, and seasonal soba, with each episode highlighting a different combination of drink and dish that deepens their bond. The manga emphasizes the sensory experience of eating and drinking together as a form of shared transgression, with guilt itself presented as the finest seasoning.