エルミナ(宮原華音)の罠に嵌り、異界に封じ込められた莉杏(南里美希)。
不気味な世界で、幻惑的な試練が執拗に莉杏を襲う。
一方、渇きに苦しむサガンの街では、アユラ(水上京香)が道外流牙(栗山航)にレクトル(こだまたいち)に救われた過去を語り始めていた。そこに、莉杏が放った魔界竜の稚魚が姿を現す。
果たして流牙は囚われの莉杏を奪還することができるのか......！？
Rian (Miki Minamizato) is trapped by Elmina (Kanon Miyahara) and sealed away in another world.
In this eerie world, Rian is relentlessly subjected to bewildering trials.
Meanwhile, in the thirsty city of Sagan, Ayura (Kyoka Mizukami) begins to tell Dogai Ryuga (Wataru Kuriyama) about her past, when she was saved by Rector (Mataichi Kodama). Then, the young demon dragon that Rian had unleashed appears.
Will Ryuga be able to rescue the imprisoned Rian...?
