Kunoichi Tsubaki No Mune No Uchi

Chapter 19: Snake And Man.
Vol.3 Chapter 18.5: Extra Chapter.
Chapter 20: Fuki's Smiling Face.
Vol.3 Chapter 18.5: Extra Chapter.
Chapter 20: Fuki's Smiling Face.
The plot centers on the titular Tsubaki Kunoichi, the best student in her school, and a curiosity that she cannot reveal.