3人兄弟の次男に生まれた健二。母親・椿からすると手の掛からない子という印象だったのだが…。ある年の春、兄は就職して1人暮らし、弟は寮制の学校に入学。父親は単身赴任と慌ただしく生活が変化して健二と椿の母子2人暮らしが始まった。賑やかだった家が急に静かになり、椿は喪失感を感じていて…。そんな母の様子に、健二は兄弟ばかりを気にする悔しさと虚しさを感じ、母親の愛情を独り占めしようとして…。

Kenji was born the second of three brothers. To his mother, Tsubaki, he seemed like an easy ***** to raise… But one spring, his older brother got a job and started living alone, his younger brother enrolled in a boarding school, and their father was transferred to a different city for work. Their lives changed drastically, and Kenji and Tsubaki began living alone together. The once lively house suddenly became quiet, and Tsubaki felt a sense of loss… Seeing his mother's state, Kenji felt resentment and emptiness at her only concern for his brothers, and he tried to monopolize his mother's love…