Vanessa Oshima has been running every day since her friend was diagnosed with cancer six years ago, and she made a promise that she would finish a 5 km run daily until her friend no longer showed any evidence of the disease.
Then, two years ago, Oshima herself was diagnosed with breast cancer. Now, after running in every major world marathon, she's doing it all over again.
On Sunday, she braved the wind and rain alongside more than 30,000 runners taking part in the annual Tokyo Marathon.