The Grand B-Master (Japanese: グランドビーマスターGurando Bī-Masutā) is the title given only to the most powerful and highest-ranking B-Shot in Crestland, and holds seniority over the other four B-Masters, as well as the Master Guardians and every one of Crestland's B-Shots in between, ruling over the Central Area of Crest Land.

Roma Day was the Grand B-Master but in Showdown at the Summit! Kamon VS Kakeru!!, he gave this title to Kamon Day.

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