Keiyaku Shimai

Vol.1 Chapter 3
Vol.1 Chapter 2
Vol.1 Chapter 4
Vol.1 Chapter 2
Vol.1 Chapter 4
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?"