謎の男・ワタルの正体は、タイムマシンでやって来た未来人だった。ワタルに促され、三人目の自分として再び同じ日の朝に戻った喜介は、子どもたちの世話や部下のフォローに奔走する。そんな中、亡き妻・華代との大切な結婚指輪を失くしてしまう。指輪を捜す喜介に、ワタルは信じられない未来について語り始める。
The mysterious Wataru is revealed to be a traveller from the future. At his urging, Kisuke returns to the morning of the same day once again, becoming a third version of himself. As he secretly looks after his children and helps his colleagues, he discovers that he has lost the precious wedding ring from his late wife, Hanayo. While Kisuke searches for the missing ring, Wataru begins to reveal an unbelievable truth about the future.
