Lost Summer

Vincent and Veronica are two average high school siblings with a kind, loving father. However, their lives are are turned upside down by one drastic event, bringing them into a whole new world (actually worlds). Vincent and Veronica must travel the nine realms, fighting Ancient Norse creatures and find out what happened to Freyr, the god of warm weather. If they do not, the world will a frozen tundra until the world ends, which also may not be far away.