Hida Reiri is the current Supreme Commander of Ataraxia and commander of its military forces as the leader of the country. As the eldest daughter of the Hida family, Reiri is the daughter of Hida Nayuta, as well as the older sister of Kizuna and adopted older sister of Setsuna. After the conclusion of the AU Conflict and Ataraxia becoming an independent nation, Reiri became its principal and commander. In order to deal with the threat the remaining AUs posed to Earth and its inhabitants, Reiri started the Heart Hybrid program where all of their Heart Hybrid Gear pilots do Climax Hybrid with (user), which is doing lewd and sexual acts with him to strengthen the bond between them for combat purposes. Due to her responsibility as the commander, she couldn't afford to show her feelings. Despite the questionable morals and strangeness of her methods, Reiri's decisions have always been for the best and greatly contributed to many of Ataraxia's victories throughout the project.