秋秋博士麾下的香蕉兵团肆意掠夺哆啦岛居民的幸福能量，并用掠夺的幸福能量给哆啦岛制造巨大危机。小靖和五名吼吼龙伙伴成立了吼吼龙守卫队，前去迎战强大的香蕉兵团，救助受困的群众，平息街道的混乱。在和香蕉兵团的屡次交锋中，吼吼龙守卫队变得越发强大团结。他们逐渐得到了居民们的认可，成长为真正的英雄。
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