Yuusha Yori Saikyouna Kuro Kishi Novel

Enclosed by the dark forest's depths, Saitou Chie confronts a grim certainty. Her childhood friend possesses all the telltale signs of a protagonist pulled straight from fantasy tales—his expanding circle of admirers proves it. When a summoning ritual suddenly yanks him into a fantasy world, she witnesses it with cold resignation. What she doesn't anticipate is him reaching back through the dimensional rift and pulling her through alongside him. The summoning tears her human form asunder; such power was never meant for fragile mortal bodies. Consciousness slips away as a deity's ancient voice resonates: "I will grant you a new body…"