A short prequel to [Introvert Tsubame wants to change](https://mangadex.org/title/1007ec9d-af06-4f22-80a7-3934f02d30b7/introvert-tsubame-wants-to-change), depicting her gloomy High School days.
Originally released as a 20-days extra contents for the original series, Grande later published this manga as an independent book.
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