Three months after giving birth, married woman Minori Kuwata struggles with childcare. Naturally clumsy and absent-minded, she fails to notice breast milk leaking through her shirt—and today, she's not even wearing a bra. Her husband scolds her, asking her not to go outside like that, even if it's just around the house. But Minori just smiles and insists she's fine. Her personality doesn't change easily. A young neighbor, normally leaving for work with sleepy eyes, notices something different today.