Riki is also a rugby coach and had a daughter, Hitoe Takeuchi (played by Nanami Ohta ), who lost her life in Wild Seven's terrorist attack on downtown Tokyo. He also takes a lot of pills although it is never explicitly stated what they are for. He probably takes pills because of his loss of his daughter.
At the beginning, Riki explains the rules of BRII. He confronts Shintaro Makimura and tells Shintaro that this is his last chance, or he died. Shintaro stated he hasn't lost yet, and the ATAT leader kills him. He also called out the names of the students that didn't make Mission 1. After that, Riki finally realizes a truth about the world he lives in. When the Prime Minister of Japan orders him to bomb the island the Wild Seven is based at, Riki is disgusted and questions the actions of the adults, so easily provoked into using bombs to get their way (much in the manner of children). When the Japanese troops raid the base on Island, Riki accompanies them. Shortly after, Saki Sakurai activates a computer that is meant to detonate Riki's collar, and then Saki dies shortly after. He enters the base wearing a rugby kit and carrying the rugby ball seen at the start of the film. He then meets with the surviving trio of Shuya Nanahara, Shiori Kitano and Takuma Aoi, and explains them that they must find their future. A collar around his neck then beeps, and he promptly throws himself into the hideout, as if converting a try, as the trio escape outside. His collar explodes, as well as the building around him, instantly killing him.