Talk:Ryougi Shiki (Assassin)/@comment-2003:6D:6E36:97C0:B4C8:B630:5806:E61D-20180215141746/@comment-124.82.74.49-20180217110612

Clear the quest on room 504 and you get to keep her permanently.

And also you might want her other 4 copies so you can upgrade her NP so her NP would hit much harder.