Stars of Destiny: Elements

It’s been years since the fall of the Ssu-Ling. Dionne and her friends have enrolled in college to gain some sense of normalcy.
Not long into the semester strange creatures begin appearing in Elysium Valley as well as another group of sehashi. The new sehashi seem to be on the same side, but are they really? Who are they and where did they come from?
Complicating their lives even further are new arrivals at their school, distracting Kousei from his studies and sehashi duties.