Based on the manga Mamonogatari Itoshi no Betty created by Koike Kazuo and Kanou Seisaku.
 
Betty, a devil-girl with the face of an angel and a heart of gold, falls in love with a human gangster, Danpei Kimogawa, when they meet during a rainstorm. They end up living together in Tokyo - though Danpei has trouble coping with his new in-laws, a witch and a demon, who like dropping by at inappropriate moments. 
 
Betty has actually been sent to the human world on a mission to defeat the demon Lutan. While Betty continues her task, her skeletal grandmother sends nubile nymphs to tempt Danpei and see if he is suitable husband material.

The last time Saki left school it was to change her school uniform for prison greys, but when the Feds needed someone to infiltrate a ruthless criminal organization operating within an exclusive high school, they knew they needed the baddest bad girl of them all! 
 
Now Saki's back on the streets for the ultimate final exam, armed with a top-secret weapon that only LOOKS like a yo-yo, and a license to use whatever force necessary to achieve her goal. Saki's lovely, lethal and ready to lay it all on the line-because if she fails this test, the next outfit she'll be wearing is a body bag! 
 
(Source: ADV Films)

Manami is your typical schoolgirl, despite the odd machines her grandfather is always building. One day, though, an odd evil robot comes to attack Minami's school, and commits the ultimate offense of threatening her friends... and ruining her lunch. Now, she will stop at nothing to return order to the world in her grandpa's newest creation: the mecha Del Power X.

Big Bang