Joshi Daisei ga Goukon de Onee-san ni Mochikaerareru Hanashi

Vol.3 Chapter 57
Vol.3 Chapter 56
Vol.3 Chapter 58
Vol.3 Chapter 56
Vol.3 Chapter 58
College girl Kawada Rika gets roped into going to a mixer where she meets an older girl named Suda Natsuko and they are immediately enamored with each other.