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...
You three are small, 
but you're very trustworthy.
.أنتن صغيرات، ولكن جديرات بالثقة
Ihr seid doch verlässlich,
obwohl ihr noch klein seid.
Son pequeñas, pero ya son responsables.
Sois pequeñas,
pero ya sois responsables.
Même si vous êtes petites,
j’ai confiance en vous.
Voi siete piccole, ma anche molto affidabili.
Vocês três são pequenas,
mas bem confiáveis.
Вы хоть и маленькие, 
но на вас можно положиться.