Masou Gakuen Hxh Specials Episode 1 -

A specialized facility designed for Kizuna and the girls to perform high-level synchronization and energy refills.

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". Masou Gakuen HxH Specials Episode 1

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). A specialized facility designed for Kizuna and the