But just as she learns Takumi has returned to the past as well, they both receive a mysterious text message …
After a night of drinking and reminiscence, Tamaki awakens to find herself ten years in the past, on the day that fateful summer began.
One day, a poor high school second-year named Futaro Uesugi comes across a private tutoring gig with good pay.
Six former classmates meet at their high school reunion: legal secretary Tamaki, businessman Takumi, single mother Yuka, shoe salesman Taichi, tech CEO Shoji, and teacher Moé.