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...
Aw, come on. We're besties!
!بالله عليك، نحن صديقتان مقربتان
Ach, wir sind doch beste Freundinnen.
Claro. Superamigas.
Claro. Superamigas.
Sois pas à cheval sur les mots…
E dai, siamo amicone!
Ah, dá um tempo.
Somos melhores amigas!
Ой, да ладно тебе. 
Мы лучшие подруги!