Wa no Kage

A world features a massive ring encircling the planet, and one nation adheres to a tradition of following the shadow it casts. This practice leads them to the northern and southern extremes of the continents. The purpose behind this remains unclear. What is known is that the nation has maintained its existence through their knowledge of "Corona Solids," materials used to craft various inventions. The most notable is the "hakukai armor," which boosts the user's innate abilities and allows for the creation of weapons. However, signs indicate that challenges are approaching for this nation.