The yearly Grand Migration, a month-long event, involved numerous bird species migrating across Shihon, a planet within the Chiss Ascendancy. As part of their wandering year, the young Chiss individuals Yoponek and Yomie journeyed to this planet to observe the migration, accompanied by their Agbui comrades, including Haplif, Shimkif, and others.
In an attempt to manipulate the Grand Migration and hasten Yomie's departure from the planet, Shimkif poisoned a significant number of indigenous bird species. Although Shimkif's actions resulted in the Grand Migration's termination, Yomie remained adamant about staying on Shihon to witness a smaller bird migration taking place in the Panopyl Mountains of Shihon.