This special is an that focuses heavily on the series' "Heart Hybrid" mechanics, which involve the protagonist, Kizuna Hida, engaging in erotic or intimate activities with the female pilots to replenish their energy and upgrade their "Heart Hybrid Gear".
You can find these specials included in the Complete Series Blu-ray sets typically sold by retailers like Amazon or through streaming services like Crunchyroll (though availability of OVAs varies by region).
It explores the awkward but deepening relationship between Kizuna and the girls, specifically highlighting Aine's tsundere personality vs. the necessity of their physical contact for combat efficiency. Availability & Production Production Studio: Production IMS. Director: Hiroyuki Furukawa.
