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The group of Yukkuri, stranded on an unexplored planet, teamed up and began building an underground base in order to survive. *Music material was borrowed from here. Start BGM Happy days by Yuuki Sakuma http://dova-s.jp/bgm/play6219.html Main BGM Holiday Going Out by Yuuki Sakuma http://dova-s.jp/bgm/play6187.html