Bokusatsu Tenshi Dokuro-chan

In the future, a man named Sakura is destined to create the technology for eternal life which, due to Sakura's lolicon tendencies, freezes all women's aging once they turn twelve. God refuses to allow this, so he sends his angels to the past to kill Sakura. However, one angel, Dokuro-chan, decides to try to change the future without killing him. The problem is that Dokuro is very temperamental, and is constantly killing Sakura (along with many others) in incredibly bloody ways with her giant spiked club. Good thing she can bring people back to life… if only to gruesomely kill them again the next time she loses her temper.