Katayoku no Khronos Gear

The story is set in the near future not long from now, when humanity has completed an orbital elevator and begun developing the outer planets in earnest. An enigmatic extraterrestrial enemy known as Obliquus has set its sights on the solar system, and humanity enters a state of war with the first aliens it has encountered. To counter the enemy's overwhelming technological superiority, the Khronos Foundation has fused the Gear — the descendants of every country's heroes from Japan's Musashi Miyamoto and Ryouma Sakamoto to France's Napoleon and Joan of Arc — with special biological weapons, thus giving birth to Khronos Gear.