On May 24, 2002 Mr. Children attended the first ever MTV Video Music Awards Japan and topped the awards show by winning 'Video of the year' for the song "Kimi ga suki". Two months after the release of the new album, Mr.Children's 23rd single "Any", was released on July 11, 2002 and used to promote "Group 10th Anniversary". The group was not able to properly promote the single. As preparations for the new tour were beginning and promotion for the new single were being done, lead singer Sakurai was hospitalized on July 21, 2002, after a blockage in his cerebellum was detected. The "Mr. Children Tour 2002 Dear Wonderful World" was canceled and all group activities were put on a temporary hiatus. While recovering, Sakurai wrote a song called "Hero", that was inspired by his hospitalization. The song was released as the group's 24th single on December 11, 2002 and was used in "Group 10th Anniversary" commercial. The first press version of the single included a DVD where, in addition to a "'Mr. Children 2002 documentary -Hero-" that was aired, the singer talked about his hospitalization and inspiration for the song. On November 15, 2002 Mr.Children's website announced the band's return to the stage for a "stew of home pride" with a one night only live, December 21, 2002 the group returned to the stage for a single concert, later released on DVD, titled "Wonederful World on Dec. 21". The group remained quiet for most of 2003. Sakurai helped to launch Artists' Power Bank (AP Bank), a non-profit environmental financial institution, in June. Sakamoto Ryuichi, a well known composer, came up with the initial idea to build a wind-power plant. With the help of Sakurai and music producer Takeshi Kobayashi, their goal later became to invest in environmentally friendly projects, such as renewable energy, and as of 2007, participated in other social issues such as helping the victims of a Chuetsu offshore earthquake in Niigata Prefecture on July 16, 2007. Near the end of the year, Mr. Children re-grouped and released their 25th single . It became their first double a-side single with "Tenohira" receiving no commercial tie-in, and "Kurumi" used to promote . The single was a hit and became Mr.Children's best selling single since 2001's "Youthful Days" single. In 2004, Sakurai started a solo project titled Bank Band, which became a spin-off of AP Bank.