Those Summer DaysAno Natsu, あのなつ。, 那年夏天, That Summer Days

Six men and women are reunited at a high school reunion. Our heroine Tamaki meets her first love again, which was unrequited, nine years after graduating high school. The next day she wakes up to find she has time-slipped 10 years into the past and is once again a 17-year-old? A love story of redoing your youth!