Since Juni-chan is curious, I thought I'd start a spoiler thread. :D
Anyway, the ending had me think of Kei in Project Eden with Bruno's beam saber thing. I'm 100% confident that a lot of beings are about to have a very bad day.
/* Miki Matsubara
"Over the Top"
_Dirty Pair Project Eden OST Album_ (1987) */
Michael C. Fortner
"Maxim 37: There is no such thing as "overkill".
There is only "open fire" and "I need to reload".