SUPER HXEROS manga volume 5 features story and art by Ryoma Kitada.

It’s just another day of science at HXEROS Headquarters. Kirara and Shiko accidentally gulp down an experimental H-Energy drink. All revved up with nowhere to go, they conspire to see which of them can make Retto explode with H-Energy first! Includes a special bonus chapter written by To Love Ru author Saki Hasemi!