▁than ▁a ▁match ▁for ▁either ▁Sh ū ▁T su ki y ama ▁or ▁N ish iki ▁N ish io ▁on ▁even ▁grounds , ▁though ▁not ▁nearly ▁as ▁strong ▁as ▁Ren ji . ▁She ▁rel uct antly ▁became ▁Kan ek i ' s ▁guide ▁to ▁the ▁gh oul ▁world ▁and ▁his ▁training ▁partner . ▁She ▁later ▁comes ▁to ▁be ▁known ▁as ▁ ▁after ▁her ▁attack ▁on ▁some ▁investig ators , ▁killing ▁one ▁of ▁them ▁in ▁the ▁process . ▁She ▁takes ▁up ▁the ▁role ▁as ▁Hin ami ' s ▁guard ian ▁after ▁her ▁parents ▁are ▁killed ▁by ▁investig ators ▁and ▁is ▁fier c ely ▁protect ive ▁of ▁her . ▁T ou ka ▁is ▁also ▁shown ▁to ▁be ▁self - aware , ▁as ▁after ▁she ▁killed ▁an ▁investig ator ▁that ▁was ▁involved ▁in ▁the ▁murder ▁of ▁Hin ami ' s ▁mother , ▁she ▁adm its ▁that ▁a ▁murder er ▁such ▁as ▁herself ▁des erved ▁to ▁die ▁because ▁killing ▁for ▁reven ge ▁is ▁wrong . ▁Despite ▁her ▁overall ▁har sh ▁person ality , ▁she ▁takes ▁her ▁job ▁as ▁a ▁part ▁of ▁the ▁An te iku ▁stability ▁team ▁very ▁seriously . ▁She ▁also ▁has ▁a ▁younger ▁brother ; ▁Ay ato , ▁whom ▁she ▁raised ▁before ▁they ▁both ▁started ▁to ▁live ▁in ▁the ▁ 2 0 th ▁w ard . ▁Her ▁brother ▁would ▁later ▁joined ▁A og iri ▁Tree ▁because ▁he ▁did ▁not ▁like ▁the ▁fact ▁that ▁she ▁enjo ys ▁living ▁among ▁the ▁humans . ▁This ▁is ▁made ▁very ▁apparent ▁after ▁she ▁starts ▁att ending ▁high ▁school ▁and ▁tal