Riku Ayakawa: 4 books

Kizuna's next target is Hayuru Himekawa, chair of the Public Morals Committee. Straight-laced and embarrassed by shameful behavior, there's something in Hayuru's past she wants to erase!

There's a new girl in town, and her name is Scarlet! The leader of the Heart Hybrid Gear unit from Megafloat West USA, she's an old teammate of Yurishia's...but for some reason, Scarlet has nothing but contempt for the blonde bombshell! As an ominous shadow looms over Aine, what climaxes will Kizuna and the girls reach in this final volume of Hybrid x Heart: Magus Academy Ataraxia?

Invaders from another world are attacking the Earth, and humanity's only hope lies in special armors called Hybrid Heart Gears, or HHGs. Hida Kizuna might seem unexceptional, but he has a skill that can turn the tide of battle--by getting female HHG users hot and bothered, he can replenish their energy!

Aine is none too pleased about lagging behind squad aces Yurishia and Hayuru. She has a plan to one-up her Heart Hybrid Gear rivals...and the first step is getting in Kizuna's pants! But when a surprise enemy attack leaves Megafloat Japan in dire straits, it may just be the opportunity Aine needs to reach a new climax and turn the tide!