The narrative focuses on a button that awards a million yen to anyone who presses it, provided they agree to spend 500 million years in isolation within an empty void. Upon the conclusion of this 500-million-year period, the individual loses that memory and reappears at the exact moment they originally pressed the button. A person possessing this button appears before Tonio, age 5; Jaibi, age 14; and Suneko, age 17—three siblings who require funds to cover their father's hospital expenses.