“Is it wrong for a girl to want to become a prince?” Nekonoyama Neneko is a demihuman in high school who can turn into a cat. While hiding her true identity from the world, she is shy around everyone anyone except her family. The only one she allows into her heart is her older sister’s friend, Mashiro. Neneko lives while continuing to admire the cool and mysterious Mashiro. One day, Neneko discovers that Mashiro is a vampire and proposes living together as her blood donor (partner). This is a romance between girls clumsy at love.