In a tranquil nook of the metropolis, four‑year‑old Kun Oota has enjoyed a pampered existence as an only child with his parents and the household dog, Yukko. Yet when a newborn sister named Mirai arrives, his uncomplicated routine collapses; suddenly life is no longer centered on him. Though he throws fits and complains, Mirai now seems to capture all of his parents" affection.
To ease this sudden shift, Kun embarks on a remarkable temporal adventure, encountering his family"s past, present, and future selves, learning what it means to belong to a household and to be an elder brother.
In the quiet corners of home within the shared warmth that binds them all together.
