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Since this applies to the Manga and the Anime (specifically an OVA), I think this probably belongs here rather than in the manga section. Pretty early on in the Manga, we get a story called We Are The Children. The gist of the story is that in an attempt to help Ataru get to school, Lum creates a portal that should get him there faster. She partially succeeds, making a portal to the school in 1991 - 12 years later as Ataru discovers when he gets inside and sees people he knows and then sees the blackboard saying "Class of '91 10 Year Reunion".