If you're looking for manga similar to Itsuka Aeru Kimi ni, you might like these titles.
1615 Summer of Osaka. Along with the flash of the moment, the warrior: Yukimura Sanada and his shinobi: The ten brave time slip to the present day! How their fate!
Mitsuaki dreams of being a pro musician, but with the deadline for his music contest only a day away, Mitsuaki is struggling to find any musical inspiration. Suddenly, Mitsuaki interrupted by a girl claiming to be from a different time! Will Mitsuaki be able to complete his music in time, and who is the mysterious time-traveling girl?
One day a mysterious woman appears all of a sudden before Makoto Akimoto, a fifth grader in today's Heisei period. But when Makoto is led by this woman to Kyoto in the last days of the Tokugawa shogunate regime...!? Moreover, what they find there is a mysterious world where weird creatures are springing out! What fate awaits Makoto?
In the middle of the night, a guy named Mirai suddenly appears inside Kako's apartment! It looks like he's fallen through time from 50 years in the future. Through a grapefruit? A bizarre story of space and time.
Shop where you can go up to 20 years in the future and spend one day there.
Tomoe Saki is a weak and cowardly girl who only learns karate. But one night, while going back home from school, she rescues a mysterious sunglasses person from a group of thugs. The mysterious person gives Tomoe a yo-yo and chooses her as the new Sukeban Deka. As Tomoe feels complicated by her new position, the yo-yo teleports her back to the Showa era in the '70s, where she encounters the original Sukeban Deka, Saki Asamiya, and helps her take down some goons. Now Tomoe must go back and forth from the past to present and help Asamiya solve various cases that reflect on the present, while trying to decide if she is worthy to take on the mantle of becoming the new Sukeban Deka.