Tsuyoshi is a 22-year-old third-year university student. He's a busy bee, juggling classes and a food delivery job, and always with a can of strong chuhai (a low-alcohol beverage made by adding distilled spirits to non-alcoholic beverages) at hand. Living alone in a small apartment, his quiet life takes an unexpected turn when he finds himself entangled with Yui Koriyama, a married woman he has admired since childhood. What starts as a simple fling soon turns into something much deeper, where the lines between longing, desire, and morality start to blur.

Set against the backdrop of cosy nights and special moments, this story is both risky and funny. It looks at the excitement and difficulties of a romance that is not allowed, where every time you meet someone is both thrilling and risky.