He holds the current unofficial world record (100,000 digits) in 16 hours, starting at 9 a.m. (16:28 GMT) on October 3, 2006. He equaled his previous record of 83,500 digits by nightfall and then continued until stopping with digit number 100,000 at 1:28 a.m. on October 4, 2006. The event was filmed in a public hall in Kisarazu, east of Tokyo, where he had five-minute breaks every two hours to eat onigiri to keep up his energy levels. Even his trips to the toilet were filmed to prove that the exercise was legitimate.
His previous world record of 83,431 was performed from July 1, 2005, to July 2, 2005.
On Pi Day, 2015, he claimed to be able to recite 111,701 digits.
Despite Haraguchi's efforts and detailed documentation, the Guinness World Records have not yet accepted any of his records set.
Haraguchi views the memorization of pi as "the religion of the universe", and as an expression of his lifelong quest for eternal truth.