1997 with Kenji and a crying baby Kanna in a convenience store. The author did not initially know that Kanna would grow into that young woman. When asked if scenes in 20th Century Boys reflect his own childhood experiences, Urasawa said about 1/10 did. He also explained that the spoon bending seen in the series was based on Uri Geller. A few weeks before the September 11 attacks, Urasawa turned in a manuscript for 20th Century Boys where two giant robots fight and destroy buildings in Shinjuku. But after the attacks, the artist could not bring himself to illustrate that scene and created a chapter almost entirely devoted to Kenji singing a song, in order to express how he felt. When Urasawa began 20th Century Boys in 1999, he was already writing Monster semimonthly and continued to serialize both at the same time. Although he was briefly hospitalized for exhaustion at this point, Monster ended in 2001 and Urasawa began writing another semimonthly series simultaneous to 20th Century Boys in 2003 with Pluto. Media Manga Written and illustrated by Naoki Urasawa, 20th Century Boys was originally serialized in Shogakukan's seinen manga magazine Big Comic Spirits from 1999 to 2006. The 249 individual chapters were published into 22 tankōbon volumes by Shogakukan from January 29, 2000, to November 30, 2006. Takashi Nagasaki is credited as "co-producer" of the manga's story. A sequel, titled 21st Century Boys, was serialized in the same magazine from December 2006 to July 2007; the 16 chapters were released into two volumes on May 30 and September 28, 2007. 20th Century Boys received an eleven-volume kanzenban re-release between January 29 and November 30, 2016. The single kanzenban reprint of 21st Century Boys, released on December 28, 2016, includes a new ending. A one-shot manga titled Aozora Chu-Ihō ("Blue Sky Advisory – Kiss") was published in the February 2009 issue of Big Comic Spirits, it was credited to "Ujiko-Ujio", the pen-name of the fictional manga creator duo Kaneko and Ujiki in 20th Century Boys. Both 20th Century Boys and 21st Century Boys were licensed for English-language release in North America by Viz Media in 2005, however their release was delayed until after their translation of Monster had finished. The first English-language volume of 20th Century Boys was released on February 17, 2009, and the last of 21st Century Boys on March 19, 2013. It had been reported that