Einstein Yori Ai o Komete: Apollo Crisis

A year has passed since his return from Ogasawara. Summer is beginning. Aiuchi Shuuta, now a third-year at the academy, idly watches the seasons drift by—carefree classmates, peaceful days, and his love Arimura Romi, who has yet to return. He simply waits, hollow and still. Then a letter arrives from Miko, head of the Comet Organization. Once more, Shuuta and his comrades are drawn into a grand scheme revolving around the comet. The final summer is about to begin.