Pairing: Rin x Haruka

The story begins when the gods call a convention to decide the whether to let humanity live or die, and settle on destroying humanity. But a lone valkyrie puts forward a suggestion to let the gods and humanity fight one last battle, as a last hope for humanity's continued survival. 13 gods will fight against 13 human champions in one-on-one battles to decide whether humanity lives or dies.

From Shoujo Manga Maniac:
Body & Soul is a manga "wellness guide," and also a surprising and touching love story. The initial story of Miku's quest for health precedes a fantastic love adventure, where love appears little by little, and where we don't expect it...