To Go Back - 戻るには - Modoru Ni Wa

What if you could simply return to a previous state in life? Perhaps back to your first day in school? Maybe your first kiss? Or your first... other things? And what if I told you about a machine that could allow you to do just that? To revisit any aspect of your life at any time. Would this be a technology used for good? Or would there be those who would abuse it? Well, this is a story of a bitter old man that just deeply wishes he could go back...
To go back.
To his perfect life.