Unlucky Skill "Patent Right" Makes Me Invincible in Another World with a High-Spec Beautiful Secretary!: If You Want to Use the Strongest Magic Monopolized by Me, a Mob Hero, You'll Have to Pay Patent Royalties!

不遇スキル『特許権』でハイスぺ美少女秘書と異世界無双!～モブ勇者の俺が独占する最強魔法を使いたいなら、特許使用料をいただきます～