Based on the mystery novel by Yagi Keiichi, the former Deputy Prime Minister was investigated after leaving a national debt of 1,085 trillion yen, but charges were mysteriously dropped. Now, his granddaughter has been kidnapped. The ransom? Either 1,085 trillion yen- the same as Japan's national debt- or a formal apology and financial reconstruction plan from the former Deputy Prime Minister are to be prepared within the next seven days. Can the police save the young girl before the deadline?
Taishi lives with his father Kazushi. His mother left home when Taishi was very young and he barely has any memories of her. He believes that his mother left home to study in Paris. His favorite moments come once a week when he receives a letter from his mother. But one day, during Taishi's summer vacation, he learns that his mother isn't in Paris but in Shodoshima, Japan. Taishi then decides to take his pet dog with him and bicycle from his hometown of Yokohama all the way to Shodoshima. On his 500 kilometers trip to Shodoshima, Taishi meets various peoples and touches their hearts, while leaving behind small miracles. What Taishi doesn't know about his mother is that she suffers from memory loss and that's why she lives apart from her family. Taishi's father Kazushi soon learns that his son has left for Shodoshima and he sets out to find his son.
Young Furuhata, a 3rd-year junior high student from Tokyo, transferred to a school in the countryside due to family circumstances. He doesn't fit in at first, but he eventually gains a reputation as a detective and opens his own detective agency. One day, he hears about the town's legend of buried treasure, and he immediately begins unraveling the mystery.
When middle-aged salary man Tsubakiyama suddenly dies, he leaves his family high and dry. But suddenly he's given another chance: a few days in which to return to Earth and straighten things out. The thing is, he's come back in the form of a strikingly beautiful young woman.
A young boy named Taichi Ogawara finds a fox cub on the side of the road and takes it home as a pet. He discovers it is blind, deaf, and mute. Because of this, he names it Helen, after Helen Keller.
