Kunoichi Tsubaki No Mune No Uchi

Vol.3 Chapter 18.3: Volume 3 Extras.
Chapter 18: Nee-Sama.
Vol.3 Chapter 18.5: Extra Chapter.
Chapter 18: Nee-Sama.
Vol.3 Chapter 18.5: Extra Chapter.
The plot centers on the titular Tsubaki Kunoichi, the best student in her school, and a curiosity that she cannot reveal.
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