夫と新社会人になった息子と、家族三人平凡ながらも幸せな日々を送っていた彩春。一方、息子が学生時代に親しくしていた遠山は、友人の母である彩春に想いを寄せていた。就職活動がはじまり会えない日々が続いても、その想いは薄れるばかりか歪んだ執着心へと変わっていった。遂に彩春を我が物にしようと彩春を訪ねた遠山。何の前触れもなく、彩春の平穏な日常は終わりを告げた。

Ayaharu was living a simple but happy life with her husband and son, who had just started working. Meanwhile, Toyama, a close friend of her son from his student days, harbored feelings for Ayaharu, his friend's mother. Even as days passed without them seeing each other due to the start of job hunting, his feelings did not fade but instead transformed into a twisted obsession. Finally, Toyama visited Ayaharu, intending to make her his own. Without any warning, Ayaharu's peaceful daily life came to an end.