The Strongest Mage Aims for a Perfect Ending

You chose "Very Easy" mode and got isekai'd into a doomed game world—but not as the demon lord you expected. Stranded on the losing side, humanity's strongest mage must rewrite fate when the Moon Saint offers an unlikely alliance. Will you save her and win her heart, or watch her fall to corruption? As demon armies modernize the continent with advanced weaponry, one mage raises the banner of rebellion to achieve the perfect ending.