異世界最強の魔神が見えるのはオレだけのようなので、Ｆランク冒険者だけど魔神のチカラを借りて無双します (Associated Names)

The main character, Kenneth, was an F-rank adventurer. His only skill is “visualization,” a unique skill. He was using this ability to look at women’s underwear when he found a girl. That girl was the world’s most fearsome demon god. Kenneth Cartoldo, an F-rank adventurer, borrows the demon god’s abilities and begins to become unstoppable.