Tokyo Revengers Season 1 Episode 52
Be Left Behind the Times
Following Tokyo Manji Gang's disbandment, Takemichi is about to return to his original timeline, but a forgotten Valentine's gift for Hina leads to an unexpected proposal. After burying a time capsule with his comrades and promising to meet again in 12 years, Takemichi makes a Time Leap. He arrives in a world where all his friends are living happily, but Mikey is nowhere to be found.