Following "Master Keaton"s end, Urasawa began "Monster" in "Big Comic Original" in December 1994. It earned him the 1999 Tezuka Osamu Cultural Prize, and his second Shogakukan Manga Award in the General category in 2001. It ended in December 2001, was collected into 18 volumes, and adapted into an anime television series in 2004. Junot Díaz, Pulitzer Prize for Fiction winner, praised "Monster" and proclaimed "Urasawa is a national treasure in Japan." With "Happy!"s ending, Urasawa began "20th Century Boys" in "Big Comic Spirits" in 1999. It earned him the 2001 Kodansha Manga Award in the General category, and his third Shogakukan Manga Award in the General category in 2002. It ended in 2006 and was collected into 22 volumes. The story briefly continued as "21st Century Boys" in 2007, which was collected into two volumes. "20th Century Boys" was adapted into three live-action films, which were released in 2008 and 2009.