Dragon Party

is a Japanese light novel series written by Yuji Nakazato, with illustrations by Daisuke Tsujita. The series began publication on May 10, 2001 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The mysterious "enemy" that human beings have encountered in space ... I saw it, but at the end, humans lose their emotions and become faithful swordsmen of the "enemy". Therefore, human beings shut themselves up on the earth and entrusted the fight to autonomous robots. A high school student, Yu Minamikata, who was desperate after being refused a dream to help his younger sister who was left behind in a space colony when he was young, meets a robot girl, Mao. While being swayed by the free-spirited Mao, Yu is run over and finds out that Mao holds the key to launching the dragon-type giant mobile space weapon "Kairyu", the trump card of humankind.