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...!
I'll give it back three times whiter than it was!
!سأبيّضُها أكثر ممّا كانَتْ بثلاثة أضعاف
Du kriegst es dreimal weißer zurück,
als es war!
¡Te lo devolveré tres veces más blanco!
¡Te lo devolveré tres veces más blanco!
Je te le rendrai trois fois
plus blanc qu’il ne l’était !
Te lo restituirò tre volte più bianco di prima!
Eu vou devolver três vezes 
mais branco do que recebi!