Chapter 2

Chapter 3

Chapter 4 Volume 1 extras

An older sister who goes to her young sister's cultural festival

An older sister who puts her little sister first

Volume 2 extras

Kasane and Mimei

Sisters who have different relationships with the people around them

An older sister who hurries home for her younger sister's sake

Sisters who celebrate a birthday together

A younger sister who loves her older sister

An older sister who isn't sure what to do

Kasane and Mimei 2

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?"
 
(Source: Comic Cune, translated)