Yuri Kitayama 
Seirei Gensouki: Spirit Chronicles (Manga) Volume 8 [EPUB ebook] 

With the emergence of the pillars of light comes a shocking reunion! Among the group of children Rio rescues stands Miharu, Haruto’s beloved childhood friend from his past life.

But Miharu and the kids are only the beginning. Rio learns of a sacred prophecy which connects the pillars to the arrival of six heroes, two of whom may well be Miharu’s missing companions.

It’s said that the heroes will appear before the sacred stones, but where are those? And what does it mean for someone to be a hero, anyway?

All the while, reports of missing adventurers continue to pile up…