怪獣島を滅ぼす野望をもって現れたちびガイガンが、悪さをしていないか見にきたちびゴジラたち。
しかし、すっかり怪獣島の自然を楽しんでいるちびガイガンの様子に拍子抜け。
ちびガイガンとの戦いのゆくえは…
Chibi Gigan has appeared with the intention of destroying Monster Island, so Chibi Godzilla and his friends go to see if he's up to no good.
However, they're taken aback by how Chibi Gigan is enjoying the nature on Monster Island.
What will happen in the battle with Chibi Gigan?
