Hybrid x Heart Magias Academy Ataraxia

In a future world where invaders from another dimension have driven humanity to live on floating islands in the sea, Hida Kizuna becomes a member of the elite Amaterasu squadron. In order to power up the mech suits of this all-girls combat team, he has to...do lewd things to them!?

Kizuna is declared the captain of the megafloat's defense squad: the Amaterasu. For his first mission, he's sent to an uninhabited island to scan for needed resources. But what was supposed to be a safe mission turns dangerous when a miscalculation sends them right into a Magitech ambush. Kizuna's Eros gear is dangerously underpowered, and Yurishia is running desperately low on energy...

Kizuna takes Yurishia on a date through megafloat Japan. They enjoy a day of seeing the sights, from Tokyo to Kyoto. But then Reiri takes Kizuna aside and tells him a horrifying truth: that if the Hybrid Count of the girls reaches zero, the pilot will die. When Aine wants to push herself to the very limit, and a huge fleet ambushes Ataraxia, how can he stop things from getting out of control?

A huge enemy fleet is bombarding Ataraxia, led by a battleship with a gigantic cannon. Amaterasu does their best to fight them off, but Aine's Hybrid Count is critically low. Kizuna is able to rescue her in the nick of time and take her back to Ataraxia, where he talks with her about her past. He finds out that Aine was also a test subject in Dr. Nayuta's experiments, and that she knows the key to unlocking her lost memories: a more advanced version of the Heart Hybrid called the Climax Hybrid.

Himekawa is guilt-stricken by her failure to protect the citizens as they boarded the Tokyo megafloat. When a mysterious radio signal is picked up by Ataraxia, she leaps at the chance to perhaps finally save a civilian. But when Amaterasu arrives at the source of the signal, they find an enemy from another world, and one deeply connected to Himekawa's past.

Himekawa needs more power to fight against the tri-headed dragon that caused her so much trauma in her past. But the pleasure of the Climax Hybrid goes against the strict and disciplined life that she's forced on herself after she failed to protect the people boarding the Tokyo megafloat. It's up to Kizuna to break down the walls she's built up for herself, and teach her to enjoy the ecstasy she needs to defeat the enemy.