Chaos Advent takes place 55 years before Attention Rookies.

1. Chapter 1 - Training Day (Training)
2. Chapter 2 - Prison Break (Intro Mission)
3. Chapter 3 - Through the soil he did crawl (Quake Earthworm )
4. Chapter 4 - Heavy Metal Mayhem ( Technetium Terrier )
5. Chapter 5 - High flying fun ( Soar Squirrel )
6. Chapter 6 - Lines in the snow ( Arctic Aardvark )
7. Chapter 7 - Flying carpets? No… Land chasers ( Shock Scorpion )
8. Chapter 8 - Not-so-Paradise Island ( Tidal Tortoise )
9. Chapter 9 - Catastrophe ( Nuclear Nightingale )

• Junas
• Hestin
• Solo
• Vasas

This series was designed to bridge the gap from X8 to Attention Rookies.