In 2002, when Yōhei Kōno fell ill from a 30-year-old hepatitis C infection, Tarō Kōno offered a part of his liver for donation.
2002. aastal, kui isa Yōhei Kōno jäi 30-aasta tagusest C-hepatiidi viiruse nakkusest haigeks, pakkus Tarō Kōno annetamiseks oma maksa.