Tokyo Pig(1997)

Original title: はれときどきぶた

Tokyo Pig is about a young boy and the adventures he has with his magic diary where anything he draws will come to life. In the first episode, "When Pigs Fly," he draws hundreds of flying pigs. As he experiences his first drawing coming to life, he tries to erase them all before his parents catch him. In his haste however, he misses one pig which becomes his pet, Sunny Pig.