Misa hero how to use?

[Niaboc]

I rolled misa and it starts off by giving you 15 energy with a 23 hr cool down. Just like the hero zin for stamina. Does anyone know how to use the 15 energy? Is there something special I need to do to activate it?

[CaChac]

a hit in battle will do (make sure that the extra energy doesn't exceed your max)