His primary function is to Heart Hybrid with the female Amaterasu to restore their powers and achieve a Climax Hybrid so they can access their Immoral Weapons or Corruption Armament. However since men have a low compatibility with HHG, his armor has low offensive capabilities. He was implanted with the first Heart Hybrid Gear (HHG) core as a child in an experiment conducted by his mother, the apparent creator of the HHG. Kizuna Hida ( 飛弾傷無, Hida Kizuna) Voiced by: Dotama Shinjuku (drama CD), Kenji Akabane (TV series) The central protagonist of the story. It was established in response to the arrival and mass onslaught of the Batlantis invasion force. It is also a Megafloat system cut off from mainland Japan. Strategic Defense Academy Ataraxia is an academy for people who use Heart Hybrid Gear. His ability proves to be critical to their success, as he and the other members of the Ataraxia defense academy find themselves engaged in a hidden agenda about the destruction of two worlds as well as to bring back his beloved from sorrow. Kizuna's fighting ability doesn't measure up, but his sister has another plan - performing erotic activities with Kizuna will allow the girls to replenish their energy or power-up. His older sister calls him to transfer to a strategic defense school, where many of the students use their HHG abilities to fight invaders from another world while wearing extremely skimpy pilot outfits. Hida Kizuna possesses a HHG, but it is not strong enough to make him particularly important. A core is implanted within a person and by calling out the HHG's name, one can summon an armor around them which can effectively combat the Alternate Universe (AU) forces. A weapon referred to as Heart Hybrid Gear or HHG is developed, which is the only effective weapon against the invaders. Mankind is forced to retreat from land and develops giant floating structures referred to as Mega Floats.

Mankind's weapons are practically useless against the invaders. The plot of the story occurs in the future when Earth is attacked by invaders from another universe through portals, and using weaponry that combines magic and science.

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