The plot revolves around a button that bestows one million yen on whoever presses it, but the buyer must endure 500 million years of solitude in an empty void. After that span, they forget the experience and revert to the instant they pressed it. A bearer of this button presents itself before 5‑year‑old Tonio, 14‑year‑old Jaibi, and 17‑year‑old Suneko—siblings desperate for funds to cover their father"s hospital bills in order to keep the family and hope for a cure and support their future.
