The Visitors
After arriving in the past and defeating a Generator that followed them, Koji, Ryo, and Gawl go in search of information. Gawl runs off in search of food as Koji and Ryo hack into the city's system and find the lab where the thing that they have come to stop, starts. Gawl runs into trouble when he is caught staring into a fast food restaurant by Masami and is arrested when she accuses him of being the "fast food stalker." Koji and Ryo clear his name by making up a story about their orphanage burning down. They are given new IDs and find a place to stay, which to Gawl's disgust, is also the home of Masami.
Aired 07/10/1998EP 1 - The Visitors

Generator Gawl
Ryou, Gawl and Kouji are 3 young boys who travel back into the past with only 1 objective: change history. In their time they discover that their country, Kubere, uses genetically enhanced persons called generators as a military tool. These generators are the cause for the Third War which kills most of the human population. Now Koji, Ryo and Gawl are there to change all the events.
(Source: Anime News Network)