5-Okunen Button

A mysterious button offers an irresistible deal: press it and receive one million yen. The price is impossible to imagine, however. The person who presses it must spend 500 million years completely alone in an empty space before returning to the exact instant they left, with every memory of that endless isolation erased.

Tonio, Jaibi, and Suneko are three young siblings in desperate need of money for their father's medical treatment. When the button appears before them, a bizarre thought experiment becomes frighteningly personal: if the suffering will eventually be forgotten, does it still matter that someone must endure it?