The Arsaga plotline ran from the 24th of November 2007 until the 7th of September 2008.
It's the most complete run of Sehto so far and thus canonical point of reference for characters, geography and historical events. This wiki will make note of deviations from Arsaga-canon where necessary. Arsaga introduced Devi Ravi, gave Dakarai N'Sehla and Jagdish Tsukinaka their canonical formal names, and highlighted the personalities of all gymleaders at least in brief.
Nonetheless, because of subjects highlighted during its run, it's not to be understood as a regular Sehto gym circuit run - the events in Taqnateh were ultimately tainted by two details: One,a non-trainer character's (temporary) possession of an Artither; two, Dakarai N'Sehla's death at the hands of Jagdish Tsukinaka because they're both stubborn idiots about the rules they subscribe to (related to the aforementioned Artither).
Generally speaking, it tracked Catherine Arsaga's children, Nikki and Marcus Arsaga, while they did the gym circuit. The two were accompanied by Neike Taika-Tessaro (Kethi City) and, eventually, Devi Ravi (Togi). Dakarai N'Sehla tracked them loosely while they travelled.
The full Arsaga logs are not up on this wiki, but some select ones have been copied over: