The town is initially invaded by the Kanto Rider Federation, a gang of Bikers from Kanto. After they are defeated, the player can continue their mission to rescue Lostelle.
Slogan
Kin Island of Family Bonding (Japanese: だいしょう そろって おやこしまThe Family Island where old and young gather alike.)
The signpost in Three Island's town suggests that the island is also known as Kin Island (Japanese: おやこしまFamily Island) due to it containing a larger island that connects to a smaller island.
The term "kin" refers to the concept of family and the relationships between its members. The Japanese term 親子parent-and-child also alludes to family.