Diabolik Chibis

After founding an old book full with weird potions and spells, Reiji decides to prepare one of them, but then an unfortunate event occurs and now the Sakamaki brothers found themselves in their old child form. So what will Yui do with these 5 young vampires , and will Shuu, the only one who remained normal, help raising his brothers until they find a cure? I suck at summaries.