Dragonaut -The Resonance

In 20XX, Earth faces a crisis as alien dragons use the planet as a breeding site. When their eggs hatch, they drain nutrients from the environment, leaving behind lifeless wastelands. Tokyo was devastated two years ago by this process, causing the death of Kamishina Jin's loved ones. He now works with Toa, a girl who previously rescued him, as part of the Dragonaut units to prevent further destruction by the dragons.