▁R ets uden ▁Zero , ▁whilst ▁M ush a ▁R ets uden ▁was ▁set ▁a ▁few ▁years ▁later . ▁Just ▁about ▁all ▁of ▁the ▁legend ary ▁def enders ▁have ▁father ed ▁sons ▁and ▁are ▁training ▁them ▁to ▁one ▁day ▁assume ▁their ▁father ' s ▁roles . ▁ ▁After ▁the ▁war ▁against ▁Yam ik oute i ▁( <0xE9> <0x97> <0x87> 皇 帝 ), ▁Ark ▁is ▁ruled ▁by ▁evil ▁forces . ▁Des c end ants ▁of ▁the ▁Seven ▁of ▁Light ▁def enders ▁scattered ▁across ▁the ▁land , ▁in ▁search ▁of ▁the ▁B uk ab uka ▁( 武 化 舞 可 ) ▁arm our ▁that ▁can ▁bring ▁peace ▁to ▁the ▁world . ▁ ▁One ▁day , ▁when ▁R ets um aru ' s ▁family ▁was ▁threatened , ▁a ▁sword ▁from ▁the ▁arm our ▁set ▁appeared ▁in ▁front ▁of ▁R ets um aru , ▁and ▁so ▁the ▁story ▁began ... ▁ ▁Volume ▁ 1 - ▁Years ▁ago , ▁the ▁forces ▁of ▁good ▁and ▁evil ▁met ▁in ▁a ▁clim actic ▁battle . ▁Now , ▁Ark ▁is ▁ruled ▁by ▁various ▁ty ran n ical ▁war riors . ▁R ets um aru , ▁son ▁of ▁the ▁legend ary ▁hero ▁Re k ka ▁M ush a ▁G und am , ▁sets ▁out ▁to ▁form ▁a ▁new ▁band ▁of ▁hero es ▁and ▁restore ▁Ark ' s ▁former ▁glory . ▁Volume ▁ 2 - ▁Un iting ▁with ▁their ▁f athers , ▁the ▁new ▁generation ▁of ▁def enders ▁prepare ▁to ▁strike ▁the ▁final ▁blow ▁against ▁the ▁demon ic ▁war l ord ▁Capit urn .