Goh Yuu possesses a unique ability: when he smells a scent associated with a memory, he can see past memories vividly. The problem is, whenever he catches a whiff of such a scent, his consciousness is pulled into the past, leaving his physical body frozen in place, dazed and unresponsive. One day, this ability almost leads to a disaster when Yuu is nearly hit by a car. Fortunately, Lee Yohan jumps in and saves him just in time. Yuu then discovers that when he is near Yohan, the scents manifest as visible forms, allowing him to avoid getting lost in his memories.