▁and ▁used ▁to ▁promote ▁ ▁Group ▁ 1 0 th ▁An ni versary . ▁The ▁group ▁was ▁not ▁able ▁to ▁properly ▁promote ▁the ▁single . ▁As ▁prepar ations ▁for ▁the ▁new ▁tour ▁were ▁beginning ▁and ▁promotion ▁for ▁the ▁new ▁single ▁were ▁being ▁done , ▁lead ▁singer ▁Sak ur ai ▁was ▁hospital ized ▁on ▁July ▁ 2 1 , ▁ 2 0 0 2 , ▁after ▁a ▁block age ▁in ▁his ▁c ere bell um ▁was ▁detected . ▁The ▁Mr . ▁Children ▁Tour ▁ 2 0 0 2 ▁D ear ▁Wonder ful ▁World ▁was ▁can ce led ▁and ▁all ▁group ▁activities ▁were ▁put ▁on ▁a ▁temporary ▁hi atus . ▁While ▁recover ing , ▁Sak ur ai ▁wrote ▁a ▁song ▁called ▁" H ero ", ▁that ▁was ▁inspired ▁by ▁his ▁hospital ization . ▁The ▁song ▁was ▁released ▁as ▁the ▁group ' s ▁ 2 4 th ▁single ▁on ▁December ▁ 1 1 , ▁ 2 0 0 2 ▁and ▁was ▁used ▁in ▁ ▁Group ▁ 1 0 th ▁An ni versary ▁commercial . ▁The ▁first ▁press ▁version ▁of ▁the ▁single ▁included ▁a ▁DVD ▁where , ▁in ▁addition ▁to ▁a ▁Mr . ▁Children ▁ 2 0 0 2 ▁document ary ▁- H ero - ▁that ▁was ▁a ired , ▁the ▁singer ▁talked ▁about ▁his ▁hospital ization ▁and ▁insp iration ▁for ▁the ▁song . ▁On ▁November ▁ 1 5 , ▁ 2 0 0 2 ▁Mr . Children ' s ▁website ▁announced ▁the ▁band ' s ▁return ▁to ▁the ▁stage ▁for ▁a ▁" st ew ▁of ▁home