"Akabane Taishi no Enoki" is the oldest hackberry tree in Japan at an estimated 800 years old; it has a circumference of 8.7 meters.
In fact, their names represent that type of weapon they wield; Tsurugi (sword), Kusabi (wedge), and Mori (lance).
The rank insignia predate World War II, but the symbolism at that time included each of the Three Sacred Treasures of Japan, with the left and right petals of the fleur-de-lis symbolizing the sacred jewel Yasakani no Magatama, and the central petal symbolizing the sacred sword Kusanagi-no-Tsurugi.
Akai Tsurugi takes place in the 10th century Nordic world, following both mortal heroes invented by the author and the Norse gods struggling against Ragnarök.