Rei Kanzaki was summoned as a hero. Betrayed by those who claimed to need him, he was cast into the Abyss — a place from which no one has ever returned. At the edge of existence, he encountered something not meant for mortals: Nebel, a cosmic being forgotten by gods and feared by creation i...

Touma Kisaragi had it all figured out: a quiet life, zero stress, and endless video games. But his childhood friend had other plans. Dragged into Seisen Academy-a prestigious institution where students awaken cosmic fragments called "Astra Core"-Touma finds himself surrounded by overpowered...