Keiyaku Shimai

Vol.1 Chapter 5.5: Volume 1 extras
Vol.1 Chapter 5
Vol.2 Chapter 5.6
Vol.1 Chapter 5
Vol.2 Chapter 5.6
Kasane Hayafuji's secret joy in life is seeing Aoyama-san, a waitress at a family restaurant. One night, she saw Aoyama standing alone in the rain. When she tried to help, Aoyama suddenly made her an offer."Will you be my big sister?"