Baby Ernst, Eru for short, the son of Hube, and several other noble born children are gathered at Covenant Castle for the "Great Birth Ceremony." After Yuri volunteers to look after baby Eru he finds out that taking care of a baby is harder than he expected especially when Eru turns out to be "special." What happens when Eru gets his hands on Anisina's latest invention, a device that allows the wearer to talk with animals?