Hybrid x Heart Magias Academy Ataraxia

is a series of Japanese light novels written by Masamune Kuji and illustrated by Hisasi. Riku Ayakawa is drawing a manga adaptation in Kadokawa's Comp Ace magazine. Yen Press has licensed the manga for release in English.

An anime television series premiered on 5 July 2016.

Plot
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. Mankind's weapons are practically useless against the invaders. Mankind is forced to retreat from land and develops giant floating structures referred to as Mega Floats. A weapon referred to as Heart Hybrid Gear or HHG is developed, which is the only effective weapon against the invaders. 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. Hida Kizuna possesses a HHG (Heart Hybrid Gear), but it is not strong enough to make him particularly important. His older sister calls him to transfer to a strategic defense school, where many of the students (many of whom are large-breasted girls) use their HHG abilities to fight invaders from another world while wearing extremely skimpy pilot outfits. Kizuna's fighting ability doesn't measure up, but his sister has another plan — apparently having erotic experiences with Kizuna will allow the girls to replenish their energy or power-up. However, his ability proves to be critical, 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.