Konjiki no Gash Bell!!

Synopsis

A boy named Kory steals Kiyo's luggage and Zatch and Kiyo chases after him, leaving Suzy Mizuno behind. After catching up with Kory, they became friends and Kiyo treated Kory's wound on his arm. Meanwhile, Suzy finds herself in a crop circle, along with Ponygon. Zatch, Kiyo, and Kory are now at the university where Kiyo's father worked. They accidentally went into Professor D'artagnan's before finding Professor Takamine's room. Upon entering Professor Takamine's room, the room was already thrashed, Seitaro Takamine was missing, and a flower was left behind. Kory knows what happened to him. Kory took Zatch and Kiyo back to his house and told them things that have been happening in London: People were being kidnapped by cursed knights, his parents were two of the people being kidnapped and Kory's arm was injured by those knights. Zatch and Kiyo then went to the cursed castle where the kidnapped people were taken; Kory didn't have the courage to go with them (yet).

On the way to the cursed castle, Zatch and Kiyo found Kanchomé and Parco Folgore on the way. They assisted Zatch and Kiyo to find the missing people. Upon entering the first room, the boys were greeted with many flower-controlled knight suits. After defeating them, they entered the second room, where flower-controlled flying swords attacked them; Zatch and Kiyo blocked them with Rashield. In the third room, the boys fell into a pit trap; Zatch and Kiyo were able to save themselves but Kanchomé and Parco Folgore fell down. In the fourth room, the ceiling was falling down on Zatch and Kiyo; Zatch held the ceiling up as much as he could and blasted the ceiling with Zakeru. The next room, they meet the ruler of the castle, the one responsible for the kidnaps, Steng, and found some of the kidnapped people. Steng summoned his fully armored mamodo Baltro and battled against Zatch and Kiyo. After finding out the armored Baltro's weakness (they shot a flower controlling an arm, knocking the arm off), Steng reveals to them that they got Kanchomé and Parco Folgore as hostages.

(Source: Zatch Bell Wiki)