“I want a divorce!” he complains to his co-workers, who are surprised since Mio used to be such a happy girl. "You make us happy we're single!" they observe.
He has no idea why Mio became such a nag, but he doesn't realize Mio has troubles of her own. Besides juggling taking care of the kids and a part-time job waitressing, she also has to deal with an elderly mother in the early stages of dementia. If only her no-good husband would take the lead and support her. But the two cannot see eye to eye.
With all this turmoil going on, Kenzaki happens to cross a former classmate of his, the dazzling Sayaka Egawa (Miori Takimoto). Over lunch, she confesses that she had a huge crush on him in college, and, with this knowledge, Kenzaki realizes this moment was the turning point of his life.
Back in their college days, Sayaka was easily the prettiest girl in school, and even then he found himself attracted to her, so when she invites Kenzaki to accompany her to a classic music concert one day, he eagerly accepts! 
The day of the concert, Kenzaki makes his way to the event on pins and needles, in anticipation of what could be. But fate steps in and while on the bus, notices a high school girl getting off and leaving her wallet. This girl, of course, is Mio, the first time she appears in his life. 
Trying to be a good samaritan, he gets off the bus and chases after her, but by the time he catches up to her, she has reported the wallet missing and he has to stay and fill a report. So much for his good intentions.
After all the paperwork, Kenzaki is utterly late for the concert, and the next time he sees Sayaka, it is with a frosty reception, believing he had stood her up.
He is already regretting helping the girl on the bus, when who should appear but Mio herself, delighted to have found him. Grateful for his earlier deed, she is excited to repay his favor, but the morose Kenzaki only wants her to leave him alone.
But the young Mio is am optimistic and genki girl, and she won’t let up, even bothering him at his workplace. She tells him if he wants a good paying job, he can be her tutor, which he reluctantly accepts.
On a nearby bench, a crackpot scientist is telling the neighborhood children about a phenomenon happening. There appears to be two moons in the sky, and this, muses the man (Namase Katsuhisa) signifies a portal where one could travel back in time.
“Travel back in time.” Kenzaki mutters. “If only I COULD.”
That evening, when he is driving home, he passes through a gate and observes the two moons up above. And as he drives through, he experiences a shift in reality and he blacks out…
When he comes to , he is stunned to find himself back in his old college dorm bed. What’s going on? His little sister Nagisa (Rina Kawaei) drops by and it’s here he realizes he has slipped back in time to his college days in 2010! What is going ON? Is it a dream?
Running to school, he experiences deja vu when is once again confronted by Sayaka who once again offers him tickets to the classic concert. He once again accepts and is determined to make sure he makes the date!
He is then rudely awakened back in 2020, where he figures it was just a dream. But he begins to notice subtle things are different. He slowly realizes that the slip was no dream, and that he can actually CHANGE things! 
Driving back to the pass that night, Kenzaki observes the two moons glowing in the sky and, with a determined will, floors the accelerator and speeds through the gates once more, this time intent on correcting all the missteps in his life!
But will he find happiness or will he realize that the grass is always greener on the other side….
WOW! What a GREAT first episode, already amped up for MORE! I initially grabbed this one because of Alice Hirose, a new big favorite of mine, but didn’t realize Miori Takimoto was ALSO in it!
Gotta say, when I originally read the synopsis that Ohkura was gonna be a husband dissatisfied with his wife, and that the wife was gonna be Alice Hirose, i thought, there ain't’ NO ONE who would regret marrying THAT fine gal! But HOLY TOLEDO, Miroi pulls out ALL the stops here- I’m telling you, she is flat-out GORGEOUS in the role if the svelte and accomplished Sayaka! 
Like, DEVASTATINGLY beautiful, so stunning and charismatic that you could see why a man like Kenzaki would spend his life second guessing his choices!
But Alice Hirose is pretty too, and in fact, most of her gloominess comes from the lack of support and sympathy from her uncooperative husband! If Kenzaki was a kind and caring partner, MOST of what makes Mio "unattractive (at least in the story narrative) would be nonexistent!
But with this newfangled time-jumping Kenzaki has acquired, I guess he’ll see if the "path not chosen" really turns out to be the one for him...or if the right girl was with him all along!
