- The school's name is composed of the kanji for "big, vast" (広) and "trunk/leaves of a tree" (末), probably a nod to the camphor tree that grows on the grounds.
- Had Taiju graduated from the school, his diploma would have read "big-tree big-tree from big-tree high school".
- The high school's name was only revealed in Chapter 157, page 4.
|Nations||Kingdom of Science • Tsukasa Empire • Petrification Kingdom • American Colony|
|Settlements||Ishigami Village • Treasure Island|
|Landmarks||The Great Buddha of Kamakura • Cave of Miracles • Camphor Tree • Hiromi College • Hirosue High • Roppongi Hills Mori Tower|
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