Medalots (parts) and medals that will appear in "2" have been largely renewed, and the previous medalot and its successor medalot were limited to the medalot used by specific characters and the hidden medalot of the previous work. On the other hand, new actions such as first aid and posture destruction were added, and the variation of parts was greatly expanded compared to the previous work.

The story is set in an underground city, an undersea city, an aerial city, as well as the universe and the moon, and the story is the core of the series, which delves into the origin of medalot.