Coral Q and Grubb are the first Mamodo duo to fight against Zatch and Kiyo after the "Milordo-Z" crisis. Their abilities are robotic transformations. Koral Q has exaggerated transformation theme music reminiscent of tokusatsu series, and Grubb is a stuck-up individual who believes he is smarter than everyone. Believing in research as just as key in defeating an opponent as spells and abilities, the duo spied on many Mamodo with the use of Coral Q's antenna, including those who fought Milordo-Z (Zofis) in the Debero Ruins.    ~!Roboruga: Koral Q shoots a laser from antennas  Roboruk: Koral Q turns into a useless robot  Ra Robogarugu: Koral Q turns into an energy reflecting robot  Bizamu Roboruga: Koral Q shoots a missile that becomes 2  Muromu Roboruk: Koral Q turns into a robot made of rubber  Digou Roboruk: Koral Q turns into a robot with a motorcycle for legs  Gigano Roboruga: Koral Q shoots a giant laser  Ganji Rudo Roburon: Koral Q turns into a robot with controllable shields!~

Kiyo is a brilliant junior high student whose inflated ego (and tendency to blow the grading curve) has made him a major target for teasing at school. So his father sends him a bizarre birthday present – a strange little boy named Zatch Bell – to help him make friends and reform his bad attitude. Zatch brings with him a mysterious red volume of spells, and Kiyo discovers that Zatch has magic powers that are unleashed by reading from the book! But there are more surprises to come, and Kiyo's destiny is about to change forever! 
 
(Source: Viz Media) 
 
Note: The chapter count includes the volume-exclusive bonus chapter “The Two Queens”.

Takamine Kiyomaro, a depressed don't-care-about-the-world guy, was suddenly given a little demon named Gash Bell to take care of. Little does he know that Gash is embroiled into an intense fight to see who is the ruler of the demon world. All of the demons have to pick a master on Earth and duke it out with other demons until one survives. Needless to say, Kiyomaro becomes Gash's master, and through their many battles, Kiyomaro learns the importance of friendship and courage. 