So the twin-tail is just an extra
And there is also a girl called koneko(小猫)... very imaginative
Dunno, seems as lame as Maken-ki, but the character designs look at least better... oh! and HSotD might not had the most intricate plot, but except from INAZUMA's original art, had also characters with interesting and quirky personalities, which made it successfully into the anime.
All in all, every ecchi anime is not made equal