The Etou family is a line of doll makers with two very special gifts: first, the ability to communicate with dolls; and second, through the help of two guardian dolls, the ability to "purify" dolls who go beserk from loneliness. These guardian dolls, western-style Leonardo Angel Silvereye and his Japanese counterpart, Yuki, come alive through the master's "proof of affection", a kiss; and they are passed down from family head to family head.