In a desolate, war-torn city, Chito and Yuuri ride a motorbike as the last survivors. Together, they scavenge for food and parts, exploring old military sites and reminiscing about the past. Battling loneliness, the girls find solace in each other's company, bringing warmth to their bleak existence. Amidst abandoned landscapes and icy battlegrounds, Shoujo Shuumatsu Ryokou follows their journey of friendship, filled with shooting practice, new discoveries, and snowball fights, as they seek hope in a dying world.