Kahara is suffering from the "substitute pain" of an agonizing toothache caused by heartache. The mysterious clinic director Kazama told her that she will be burdened with the toothache until she figures out the culprit behind her heartache. Kahara suspects her ex-boyfriend, who was cheating on her and then dumped her. She also considers the closure of her favorite bar, annoying noises from her neighbor, and problems with her boss. Perhaps it was the cumulative bulk of all these things that was weighing down on her. Can Kahara find the real culprit and come to terms with the cause of her pain?