Yoshinaga-san'chi no Gargoyle

Yoshinaga-san Chi no Gargoyle (吉永さん家のガーゴイル) is a Japanese light novel series written by Sennendou Taguchi. The series was first published in 2004 by Famitsu Bunko (Enterbrain) and is still currently running in Japan. Later, the series was adapted into an anime series, which broadcast on Chiba TV on April 4, 2006 for 13 episodes.

Plot
Kazumi Yoshinaga was just a normal king along with his younger sister, Futaba and his family. One day, Futaba won the first prize in a lottery which turns out to be a stone wolf-like gargoyle. More surprising yet after nicknaming it "Gar-kun", the gargoyle turns out to be alive.