Takagi Mamoru, a bachelor in his 40s, becomes the guardian of twins Kaoru and Yuki after the death of his friend. As they adjust to their new life, they are joined by a secret: Mook, a miniature Schnauzer who can speak. While Mook serves as a protector and mentor to the twins, he often criticizes Mamoru for his shortcomings as a guardian. Over time, Mamoru comes to accept Mook as the bond
