Hanegi Manami is a junior high school girl with eccentric relatives, to say the least. Her grandfather's passion is building unusual things, and has just had his latest concoction delivered to their doorstep — the mecha known as Del Power X. With a driver's seat specially designed for Manami, its powers are rivalled by no other. Unfortunately, her grandfather's rival Von Getsueru and a plethora of other people are determined to prove that fact wrong, regardless of who is in the pilot's seat. Manami must fight for love, pride, and above all else, the loss of her precious bento!