Gendai no sekai de, ningen no seikatsu wa daikibo ni henka shita. Danchu ga machi zentai ni araware, monsutaa ga detekuru to, jinrui wa hitotsu no koto ni kizuita: tokushu na chikara wo motsu mono dake ga taoreru koto naku ikinokoru koto ga dekiru. Hitori hitori ni wa, danchu wo tadoru toki ni hatarakeru yunikku na sukiru ga aru ga, subete no chikara ga yakudatsu wake de wa nai. Allen, futsuu no seishounen, wa hoka no hito kara wa hen to omowareru kinou wo motte ita. Tomodachi no me ni wa, kare wa party no tame no omoni ni suginai. Aratana kiken na danchu ga karera wo semeru toki, Allen wa party wo mamoru tame no mitama to shite tsukawareru. Shikashi, inochi ga kimi ni shimesareru toki, kare no hontou no chikara ga mezameru: Shadow Abyss, karada wo tsutsumu yami no chikara ga, Allen wo osoroshii kyoui ni kaeru. Yowaki to omowareta shounen wa, osorerareru hunter e to michi wo fumidasu koto ni naru.