 If you liked
Ziga
|
 ...then you might like
Kaijuu 8-gou
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Just like in this manga, the main character is able to transform into a kaijuu, and he also joins the defense forces. Some plot paths overlap due to the same setting and idea.
Against the background of "Kaijuu 8-gou", I consider" Ziga " an undeservedly forgotten work.