Shimamura worries about Adachi when she doesn't come to school the next day after she abruptly left her house. The two girls go out together on the weekend and an unlikely guest joins them.
You can call me Big Sis anytime.
Du kannst mich gern
große Schwester nennen!
Puedes llamarme hermana mayor.
Puedes llamarme "hermana" 
cuando quieras.
Tu peux m’appeler « ma sœur chérie ».
Puoi chiamarmi sorellona quando vuoi.
Pode me chamar de
"irmãzona" quando quiser.
Разрешаю звать меня сестричкой.