Shinju no Nectar

Sakra, the last surviving princess of a fallen kingdom, is relentlessly pursued for the power of Ambrosia she carries—the ability to bestow divine strength, but only upon a human. With no human ally at her side and her enemies closing in, Sakra makes a desperate decision: she summons a companion from another world, hoping to find a valiant knight to protect her. However, the man who answers her call turns out to be far from the hero she had envisioned...