Kuchibashi ga Kīroi (くちばしが黄色い – Young and Inexperienced)
Kuchibashi ga Kīroi くちばしが黄色い The Japanese idiom kuchibashi ga kīroi (くちばしが黄色い) describes that someone is still young, inexperienced, and immature.
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Kuchibashi ga Kīroi