Isekai H Eiyuuden ~Bishoujo Senshi-tachi wa Saikyou Gunshi no Muchana Onegai ni Sakaraenai~

Noa Zuiho is an unassuming second-year high school student, distinguished only by his exceptional gift for tactical analysis—until the day he is suddenly transported to another world. This new realm is engulfed in a brutal war between humanity and the monstrous forces threatening to consume it. Hoping to turn the tide, a goddess grants Noa the Power of Wisdom, a divine boon that dramatically heightens his strategic insight. Yet the gift carries a scandalous condition: his tactical genius can only be strengthened through erotic encounters with the beautiful warrior maidens who fight as humanity's protectors. For the mild-mannered young man thrust into the role of their strongest strategist, voicing such brazen requests is mortifying—and for the warrior maidens on the receiving end, refusing them proves nearly impossible. Caught between the fate of an entire world and his own embarrassment, Noa must learn to wield both his unmatched intellect and his wildly unorthodox new power. As the epic clash between humankind and the monster armies rages on, the destiny of two races comes down to a single question: which side will prevail?