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Rumina Asagi is a first year high school-er in Tokyo. When we first meet him, he dreams of his perfect high school life, which involves being a person who doesn't get into fights and someone who has a girlfriend. Upon awakening, we see that Rumina is tested on a daily basis in survival (in obstacles that are in the region of "if you fail, you die!") and sword training. He protects another freshman on his first day because the bullies end up making the freshman's girlfriend cry, showing that he cares a lot about other people’s feelings. At the conclusion of his first day at school, an explosion is heard at the temple where Rumina lives. This was caused by an Underground bodyguard known as Chelsea Rorec trying to protect her ward, Ruri Sarasa. After a discussion with the two, Rumina takes Ruri out for a walk around the temple, which leads to a capture attempt by Underground admin, Seiki. Rumina is killed by Seiki whilst trying to defend Chelsea and Ruri, to which Ruri uses her power to resurrect Rumina, as well as granting him a power over wind
The following day, Rumina is forced into a confrontation with electricity manipulator, Sheal Massiah. He cannot use his newly acquired ability against her until Ruri's life was put in danger with an out of control thunder ball. As Sheal was only told to confirm "the surface dwellers" wind power, she withdrew from her battle with Rumina, who was oblivious to her disappearance.
Rumina ended up taking care of Ruri until she was kidnapped on a night visit to Rumina's school. It was here where Rumina first used his power to breaking point, as well as gaining a rival in Tail Ashford. After the kidnap attempt by Tail And Company number 2: Pyron, Rumina receives training from his grandfather in the traditional Asagi sword style. After his training came along on leaps and bounds, Rumina, Chelsea and Ginosuke ventured into the temples booby-trapped cave to receive the temples treasure: The wind sword Kogerasamaru. This enhanced his power tenfold and became Rumina's signature weapon for the series. Rumina has a range of abilities that have been expanded as the series progressed. He is an apt martial artist and swordsman, capable of taking out a group of thugs in under a minute. His wind based abilities start off with a powerful, if unaimed, wind blast. After the training from his Grandfather, he gained the ability to accurately cut object large or small in half with his styles signature, Gale Force Wind. In his second fight with Tail Ashford, Rumina's abilities with the wind were boosted as he is shown now to be able to levitate by gathering the winds. He is also able to read the winds at startling speed. According to Tail, his attack (Tidal Knives) strikes the opponent at all angles faster than the naked eye could follow, so Rumina's reaction to touch is far superior to his sense of sight.