Miyu Sugiura, a hardworking career woman known as "Chiri," has always struggled with drinking alcohol, having faced repeated failures since her school days. Though she believed she wasn't weak against alcohol, she was assigned to lead another major project and, one evening, was put in charge of client entertainment. Things seemed to be going smoothly until she unexpectedly drank far too much. When she came to, she found herself in bed with an unfamiliar man. Fragmented memories of the previous night returned—once again, she had succumbed to the effects of alcohol. Torn by guilt and shaken pride as a professional woman, Chiri fell into a troubled sleep.