Gonna Be The Twin-Tail!! Vol. 8 (Light Novel)

In Vol. 8, Aika begins feeling inadequate as a Twintail in the face of increasingly powerful Elemerins, and when her sister almost discovers her identity as Tail Blue, she decides to not transform for a while and takes off her bracelet. But while in her defenseless state, she is targeted by an Elemerian and transported to another world! How will she survive alone in another world unable to transform?
Notice: This book is written in Japanese.