The Girl Who Leapt Through Time

Makoto Konno, who enjoys playing baseball, lives with her parents and younger sister Miyuki in the Shitamachi area of Tokyo, Japan. Her aunt Kazuko Yoshiyama, is an art restorer at the Tokyo National Museum.
One day, when Makoto discovers a message written on a blackboard at her high school, she inadvertently falls upon a walnut-shaped object. On her way home, Makoto is ejected into a railroad crossing when the brakes on her bicycle fail and is hit by a train. She finds herself transported back to the point in time when she was riding her bicycle right before the accident. Kazuko explains to Makoto that she has the power to "time-leap", to literally leap through time. At first, Makoto uses her powers to avoid being late, getting perfect grades, and even relive a single karaoke session for hours, but soon discovers that her actions can adversely affect others.
Consequently, Makoto uses most of her leaps frivolously, to prevent undesirable situations from happening, including an awkward love confession from her best friend Chiaki Mamiya. Makoto realizes that she has a numbered tattoo on her arm indicating the limited amount of times she can time leap. Using her remaining time leaps, Makoto attempts to make things right for everyone. When Chiaki calls Makoto to ask if she has been time-leaping, she uses her final time leap to prevent Chiaki's call. In the mean time, Makoto's friend KÅsuke Tsuda and his new girlfriend, Kaho Fujitani, have borrowed her faulty bike. Makoto attempts to stop them, but because she had just used her final leap, she arrives too late to the crossing only to watch them get hit by the train.
A moment later, Chiaki freezes time, telling Makoto that he is from the future. He explains that the walnut-shaped object is a time-traveling device, and he used it to leap through time hoping to see a special painting that is being restored by Kazuko, as it has been destroyed in the future. While walking with Makoto in the frozen city, Chiaki also explains that he stayed longer in her time frame than he originally planned. Consequently, he has used his final leap to ensure KÅsuke's existence and has stopped time only to explain to Makoto what the results will be. Having revealed his origins and the nature of the item that allowed Makoto to leap through time, and now unable to return to his own time period, Chiaki must leave. Makoto then realizes that she loves him.
True to his words, Chiaki disappears once time resumes. Initially distraught by Chiaki's disappearance, Makoto discovers that Chiaki's time-leap had inadvertently restored a time-leap to her: Chiaki had leapt back to the time before Makoto used her final leap. Makoto uses it to safely leap back to the moment right after she gained her powers, at which point Chiaki still has one remaining time-leap, and recovers the used up time-travel device. Makoto explains her knowledge of everything and shows the device to Chiaki. Makoto vows to ensure the painting's existence so Chiaki can see it in his era. Before Chiaki departs, he tells Makoto that he will be waiting for her in the future. When KÅsuke asks her where Chiaki went, she says that he went to study abroad, and that he made a decision about his own future.

Question: What does Makoto fall upon ?
Answer: She falls upon a walnut shaped object.