Konjiki no Gash Bell 2: Attack of the Mecha Vulcans

With only Coast School in mind, Takamine Kiyomaro leaves Gash bewildered that he'll make a new Volcan 300 for him to play with. The genius tries to catch up with the bus that would take him there, but a giant Volcan 300 kidnaps him. Meanwhile Gash befriends the same Vulcan that kidnapped Kiyomaro later named: Volcan 300 Generation 4. The genius wakes up to see that he isn't in Coast School, but that a doctor by the name M2 wants him to be his partner in the future. (myanimelist.net)