ery ▁and ▁multiple ▁world ▁myth ologies . ▁ ▁The ▁game ' s ▁script ▁was ▁written ▁by ▁Na ot aka ▁Hay ashi , ▁a ▁staff ▁writer ▁at ▁ 5 pb . ▁whose ▁most ▁notable ▁work ▁at ▁the ▁time ▁was ▁visual ▁novel ▁Ste ins ; G ate . ▁After ▁playing ▁through ▁Ste ins ; G ate ▁on ▁the ▁recommendation ▁of ▁another ▁staff ▁member , ▁As ano ▁decided ▁that ▁Hay ashi ▁would ▁be ▁able ▁to ▁create ▁the ▁appe aling ▁characters ▁and ▁surprising ▁scenario ▁needed ▁for ▁the ▁story , ▁and ▁asked ▁ 5 pb . ▁if ▁Hay ashi ▁could ▁work ▁on ▁Bra v ely ▁Default . ▁Another ▁reason ▁As ano ▁wanted ▁Hay ashi ▁was ▁due ▁to ▁the ▁plot ' s ▁heavy ▁use ▁of ▁parallel ▁world s . ▁Hay ashi ' s ▁work ▁on ▁the ▁game ▁involved ▁creating ▁the ▁plot ▁and ▁character ▁settings . ▁While ▁he ▁wrote ▁the ▁majority ▁of ▁the ▁game ' s ▁dialog ue , ▁more ▁detailed ▁work ▁was ▁given ▁to ▁writers ▁at ▁Square ▁En ix ▁and ▁Sil icon ▁Studio . ▁One ▁of ▁the ▁supp lement ary ▁writers ▁was ▁Sil icon ▁Studio ' s ▁Ke i ichi ▁A ji ro , ▁who ▁wrote ▁the ▁contents ▁of ▁D ' s ▁Not ebook . ▁A ji ro ▁also ▁created ▁the ▁initial ▁story ▁outline ▁with ▁As ano . ▁The ▁initial ▁story ▁concept ▁was ▁kept ▁deliber ately ▁simple , ▁but ▁its ▁complexity ▁increased ▁during ▁the ▁writing ▁process . ▁During ▁his ▁work , ▁Hay ashi ▁was ▁given ▁gu idel ines ▁by ▁Square ▁En ix ▁about ▁the ▁characters ▁and ▁story : ▁for