One day, old man Yamada, who had lost his wife and was living alone, found a flyer for an aphrodisiac. He ordered it immediately and tried it, and his penis, which had been useless for a long time, became hard again! Thinking that he had become invincible, the old man mustered up his courage and called a delivery health girl, but when the dazzling Erika arrived, he was instantly Kokoro.