Inside the Kyoto Station Building, there was a Tezuka Osamu World (closed on January 16, 2011), which housed a theater called the 300-inch Theater. This original short anime was screened there. The program consisted of a double feature: an animation work packed with the essence of Tezuka's representative manga, and an animation introducing historical episodes related to Kyoto. The two parts were connected by the Phoenix acting as the storyteller. Exploring the theme of "How does love grow into an unchanging force within a limited lifespan?", the Phoenix selects and introduces the story "Grandma" from the episodes of "Black Jack." She is an old woman who is miserly with money, and whenever she opens her mouth to her daughter-in-law, it's only to pester her for pocket money, saying, "Give me some money." Her son and his wife are fed up with this grandma. Because of this, arguments never cease in the household, and peaceful daily life seems lost. Black Jack, who happens to become acquainted with this family, eventually learns that this old woman once had a terminally ill young son saved by a famous doctor who demanded a huge sum for the treatment. For decades, she has been continuously paying off the medical fees to the doctor who saved her son's life. Love for her son. As its price, an old woman who spent her entire life solely on paying those medical fees. And the son, unaware of his mother's feelings, who could only sigh while caught in the disputes with his wife. When he learns the truth about his mother, he comes to understand the "love" of a mother who lived for "love for her child, more precious than her own life." Then, Black Jack asks him if he can love his mother with an equal amount of love. The Phoenix states that such "love more precious than life" itself possesses eternal life, and proceeds to talk about the grand national project "Heian-kyō Relocation," which aimed to give eternal life to an entire city itself.