I Forgot How to Use Magic in World War II in Another World

[Travel + no system + different world + magical World War II + multiple female protagonists + mid-term transfer to another world machine battle] Traveling to another world, Leisen was involved in the war at the beginning. With the industrial revolution and the powerful power of the internal combustion engine, the magic of other worlds has long been a thing of the past. Now the wars are dominated by machine guns and tanks, aircraft and warships. But surprisingly, these gadgets are only of World War II level? The evil Demon King's Army wanted Leisen to be their war weapon, but Leisen used powerful magic that had long been abandoned by people from other worlds to lead the mainland coalition to defeat the Demon King's army. But as he continued to fight, he discovered that this world actually shared the same secret passage as the earth. Go home? Can. But this war spanning two worlds must be fought first. Reference works: "Holy Warrior Danbine", "Mobile Suit Z Gundam", "Mobile Suit V Gundam", "Legendary Titan Idean", "Soul Force"