Tsurumisaki, along with the other members of the Plus Six, are unknown to Maguro Kurokami, indicating that they did not become a part of the Flask Plan until after he left.  He is a junior of Class 13 and a former member of the Flask Plan's Plus Six. 

A former royal warrior and member of Chup's crew.

Takagi is the athletics club advisor teacher at Sugisawa Third High School.

Borahorn is a minor antagonist in Dragon Quest: The Adventure of Dai and its animated adaptations. He is one of Baran's direct subordinates and one of the lieutenants of the Dragon Legion as its Sea Dragon Rider.

Assistant boys' volleyball coach for Shiratorizawa Academy

A famous music artist who also composes, arranges, writes and produces songs. Many of the songs by him were big hits.

Kubifutoshi is a member of the Wankoro police with the most serious personality of the group.

Kenji Sugimura

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