After graduating from university, Satoshi moves to the city to start a new life and visits his neighbors to introduce himself. To his shock, he discovers that his next-door neighbor is Kiriko, his mother, who was presumed dead. The sudden reunion leaves Satoshi bewildered, while Kiriko is equally confused. Struggling to bridge the emotional distance built over years apart, both wrestle with their feelings. Satoshi finds it difficult to call Kiriko "Mother" again, while Kiriko, burdened by loneliness, desperately tries to rekindle their bond. As their emotions grow tangled, the evolving relationship takes an intense and intimate turn, blurring the lines between mother and son, leaving the future of their connection uncertain.