Hagyaku no Dragoon: Rakugo Ryuukishi wa Unmei no Hime to, Akatsuki no Kyokkou Sekai wo Kakeagaru

In a world where science and dragons co-exist, Kurou is a boy who attends the military school for Dragoons. One day, a bizarre occurrence fell upon him. An aurora covered the skies, and suddenly, the adults started to massacre the 16-years old youths, proclaiming them to be a weak generation. Kurou was one of the top fighters in the school, but was treated as an outcast due to his rebellious nature. In the chaos, he came to meet with the 16-years old princess, Lutiee, and they managed to steal away on a military airship. While fighting against their mysterious enemy, the adventure through the skies while gathering companions…! Source: Hobby Japan