Hitotsu no Tairiku no Monogatari: Allison to Will to Lillia to Treize to Meg to Seron to Sono Hoka

Allison watches as Major Travas departs, but the plane is soon destroyed in an explosion. At the same time, Lillia's school newspaper club starts looking into Treize, a student who recently transferred. They notice something unusual happening near the lockers, which leads them into a larger unfolding event. The characters from the Allison series experience their final story in this combined adventure and school life narrative across two volumes.