In the OVA , She wears black ankle boots and thigh - high stockings , with a shackle around her left ankle .
Strength is Yuu 's darken persona in the other world .
In the OVA , Yuu wears black ankle boots and thigh - high stockings , with a shackle around Yuu 's left ankle .
Strength is Yuu 's darken persona in the other world .