On the day of the Tennomifune Academy entrance ceremony, in the class 1-7 classroom, Hanakoizumi Anne (Hanako), Hibarigaoka Ruri (Hibar), and Kumegawa Botan (Botan) are told by their homeroom teacher Kodaira-sensei that they are unfortunate and unhappy students.
The goal of the students of class 1-7, who are burdened by a variety of forms of misfortune, is to become happy.
The three girls have trouble accepting their circumstances, but they're immediately given an unexpected assignment...!
She must've had something 
very important to do.
لا بدّ وأنَّ لديها عمل مهمّ تقومُ به
Sie hat bestimmt
etwas sehr Wichtiges zu tun.
Debió tratarse de algo importante.
Seguro que se trataba de algo importante.
Elle devait avoir un impératif.
Doveva trattarsi di un impegno importante.
O que ela tinha para fazer 
deve ser muito importante.