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...
Nee-chan said girls don't 
kiss once they grow up.
قالت نيتشان أنّ الفتيات
.لا يقبلن بعضهن عندما يكبرن
Unsere Schwester hat gesagt, dass sich
große Mädchen keine Küsschen geben.
Mana dijo que las chicas
no se besan al crecer.
Mana dijo que las chicas
no se besan al crecer.
Elle a dit
que les grands s’en font pas !
La sorellona ha detto che
le ragazze grandi non si danno i bacini.
A Nee-chan disse que meninas
não se beijam quando crescem.
Сестра сказала, что взрослые девушки 
не целуются.