Miwa is informed that her time is limited due to heart disease. Submitting a letter of resignation to her workplace, she says good-bye to her boyfriend, Shinji (Tetsuji Ohashi), being afraid to become a burden to him. Throwing off Shinji's hand, Miwa sets off on a lonely journey. The one who comforts the broken-hearted Shinji is his colleague, Kyoko (Mayu Asada). Soon, the two fall for each other and become lovers. Learning of their relationship, Miwa goes mad with jealousy. She tries to trap Shinji with whatever means she comes up with. Becoming a stalker, Miwa persistently corners Shinji and Kyoko. How far will she go?