Hamatsu was challenged to stay alone, unclothed, in an apartment for Susunu! Denpa Shōnen, a Japanese reality-television show on Nippon Television, after winning a lottery for a “showbusiness-related job”. Hamatsu was challenged to enter mail-in sweepstakes until he won ¥1 million (about $8,000) in total. Hamatsu started with nothing (including no clothes), was cut off from outside communication and broadcasting, and had nothing to keep him company except the magazines he combed through for sweepstakes entry forms. After spending 335 days to reach the target, Hamatsu set the Guinness world record for the “longest time survived on competition winnings”.
https://en.wikipedia.org/wiki/Nasubi