Yumiko Tsukamoto

In trying to find a way to repel a hostile attack on her castle, Princess Luna of Rimzbel stumbles upon an ancient power. This allows her to summon a dinosaur demon that obeys her commands. Unfortunately, when the creature is around, she is attached to its head and acts as its brain. Her younger sister is then captured, and she must journey to find and save her. (animenewsnetwork.com)

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. (myanimelist.net)