An asteroid headed for Earth destroys Pluto. the asteroid, is dubbed Thanatos. in order to save earth the International Solar system Development Agency works on the "D-Project", and secretly creates weapons called "Dragons. However, they soon find out that the asteroid is not their only threat, as powerful, destructive dragons from Thanatos appear on Earth. Jin Kamishina, and Toa, gets involved with the ISDA. they encounter new friends and enemies, and also develop a closer relationship.

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