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 knew you were pretty, but I 
had no idea you were an angel!
أعلمُ أنّكما جميلتان، لكن لم أكن أعلمُ أنّكما ملاكتان
Eure Schönheit fiel mir gleich ins Auge,
doch dass ihr auch noch Engel seid …!
¡Sabía que eras bella,
pero no que fueras un ángel!
¡Sabía que eras hermosa,
pero no que fueras un ángel!
Votre beauté n’a d’égale
que votre angélique bonté, Mlle Hibari !
Mi ero già accorta che siete delle bellissime ragazze,
 ma non pensavo foste addirittura degli angeli!
Eu tinha notado que você era linda,
 mas não sabia que era um anjo!