It is revealed that Vamola, the girl found inside the kaiju suit, is actually a member of the once thriving Sumerian race from deep space! Unfortunately, her home world was attacked by the aliens presently targeting Earth, leaving her people scattered. She herself had been forced to plot her escape from the planet with a group of other women—including Banga, who found her as a child and raised her. Now, having learned of Vamola’s past, Momo and the others rise to action, but the aliens they face are a formidable enemy.

 

身穿怪獸皮套的巴莫拉，本來是在遙遠的宇宙，國家一度繁榮的蘇美人？
在故鄉的星球上，同胞們受到目前企圖佔領地球的外星人襲擊，流離失所。

巴莫拉和她當成母親追隨的斑嘉等一行人，嚐試逃出星球，但是…另一方面，小桃等人得知巴莫拉的生世，奮勇抗敵，但是外太空的外星人實力極強…。
 

——中文簡介摘自東立出版《膽大黨 13》