KAKYUUSEI 2: HITOMI NO NAKA NO SHOUJO-TACHI

Many people have fond memories of meeting a certain teenage boy in their younger years. However, their ages vary widely, and each remembers him as a teen. This story follows the intricate intertwining of their various stories and how this young man, who apparently lives outside of time, has affected each of them. — Description from AniList community (anilist.co).