Himeno has a young cousin named Shino-chan. Manami, as well, has three young triplet sisters, and an even younger fourth sister. One day, Manami orders her triplet sisters to stay home and watch their youngest sister while she goes out. This leads the four youngest Mitama sisters to experience a truly mysterious phenomenon...
Is the big onee-chan your friend, Nee-chan?
هل أوني-تشان الكبيرة صديقتك يا نيتشان؟
Bist du eine Freundin
von der Hime?
¿La niña grande es tu amiga?
¿La niña grande es tu amiga?
T’es copine
avec la grande madame ?
La sorellona-ona è tua amica, sorellona?
A Onee-chan gigante é sua amiga, Nee-chan?
А вы с сестрёнкой Химе подруги?