Talk:Erina Shindō/@comment-216.251.136.34-20141106161633

I think Tail gears technology allow the user to change appearance as they see fit to keep their true identity in secret or another reason why they change appearance because it reflects the desire from their hidden self.

So Erina maybe she want to be mature lady instead of being a high school kiddo from the bottom of her heart and tail gear transform her into the mature appearance.

For Soji, since he loves twintails so much and height didn't really matter for him so tail gear transform him into a long twintails imouto. (my guess)

Aika in other hand, her true hidden self is just herself. So even after she transform with tail gear; her appearance did not change much.