Tenrou is one of 22 nations in Wakoku.
Tenrou has been waging war over Soukai for ages and always failed at invasion attempts. Sakuza, one of the nation's Commanders, was slain by Hinowa during the battle on the sea where Yomihime forced the rest of Tenrou's troops to retreat after retrieving his head and killing Hinowa. Yomihime states that the unification of the land is on the grasp, but Tenrou has a long way to go in order to achieve it.
Ten years later, Yomihime led her own troops into Mt. Kageboshi to attack the least guarded area at the east of Shiranui Fortress in an attempt to capture it. She encounters Elder's Class include Hinata but later was forced to retreat thanks to Akame's nick of time reinforcement and losing the duel to Akame.
Several months later, Tenrou resumes the invasion and this time they are targeting Shiranui Fortress with Kyoukotsu and Yomihime as Commander. With the death of Kyoukotsu, the King decides to call upon Ten Stars of Tenrou with Nahashu as one of them.
The King of Tenrou has spent most of his fortune mass-producing Meihou, a Teigu-like weapon that was forged by using Danger Beasts as raw materials and the Ten Stars of Tenrou are rumored to wield it.
Tenrou has many Commanders with at least ten of them being at Tenrou's services. The Elitest Commander is known to be as Ten Stars of Tenrou, a position that was ranked above Commander and the highest rank on Tenrou.