Kizuna Hida hasn’t been able to take full advantage of his new ability until one fateful day. His older sister calls him up and invites him to transfer over to a strategic defense school who houses some of the greatest defense forces in all of Japan. Like some of those students, Kizuna is a gifted individual who possesses the HHG (Heart Hybrid Gear) who a certain group of otherworldly intruders would like to possess. In order to defend the country from the ongoing attacks from these sinister beings, Kizuna, along with a few busty girls are going to have to make things work. Kizuna’s HHG is meant to complement the other girl’s strengths and in order to reach their pinnacle, they will need his help. For that to happen Kizuna has to sexually pleasure them, only then will the big guns come out to play.

Masou Gakuen HxH is a peculiar anime. It demonstrates a strong emphasis on lewd acts that are committed by Kizuna to his female partners. Frankly, it’s no different from Basara and his harem of gorgeous girls. Kizuna and Basara both perform stimulating sexual acts with the females they’re surrounded by and by doing so, it strengthens their bond and also elevates their power level. Despite what it looks like, both Kizuna and Basara aren’t complete perverts. Sure, they do get aroused by performing those tasks, but who wouldn’t? Basara was exhorted into having a magical bond made with Mio and Kizuna was instructed to keep the girl's vital signs up in their HHG. Ultimately they’re put in that situation for the girl’s best interest.

Thirty years prior to the start of Hagure Yuusha no Aesthetica, Akatsuki Ousawa was one of several people selected from Earth and sent to other worlds. Not everyone was able to return, but Akatsuki was one of the lucky ones. He was sent to Alayzard to defeat a dark lord named Garius prior to making his return. Unlike other fortunate people who brought back trinkets from their otherworldly experience, Akatsuki brought back the dark lord's daughter, Miu. Now with Miu posing as his little sister, they will train to one day master their powers at a special school called BABEL. It is there that they hope to be able to serve all of mankind with their potential.

One of the first things that might jump out at you when viewing these two series is that both male main characters are heroes that were called upon to save the world. They weren’t summoned in an orthodox manner, however. They were elevated to hero status but not by their own accord. Regardless of how they became heroes, Basara and Akatsuki’s power is undeniable to us. They care deeply for their friends and would do anything to keep them safe, which is exhibited in both anime. The most interesting dynamic that these two shows share is that both Mio and Miu are daughters of demon lords who end up living together with the main characters and pose as their younger sisters. Throw in some fanservice and you got a receipt for a good time.

The story tells a tale of a teenage boy named Raul Chaser who was studying for his hero exams in order to become a hero. His ultimate goal was to defeat a demon lord and eventually have others label him a hero. Unfortunately for Raul, that never happened because the demon lord he was planning on going after had already died prior to the completion of his hero exam. After seeing his dreams ultimately cut short, he decides to take a job at a local magic shop. Everything changed however when a female named Fino Bloodstone applied to work at the magic shop. He noticed right away on her resume that she was the daughter of the deceased aforementioned demon lord. How will these two get along when you have a hero-in-training and a fallen demon lord’s daughter in the mix?

A daughter of a fallen demon lord receives protection from a heroic human. Does that sound familiar? It certainly should! With what seems to be a running theme on this list, it’s only fitting that we get our first similarity out of the way. Raul meets Fino and despite not earning the hero status, he becomes one anyways in order to preserve the fallen demon lord’s daughter. It’s similar to how Basara a former hero, becomes one once again to save Mio from all who threaten her. Despite being a demon, Fino applies to become an employee of a magic shop to live a care-free normal life. In the same token, Mio also wants to live without the scrutiny from power-hungry demons trying to kill her for the crown.

Shinichirou Asano is a high school student who’s had it rough. He’s had his parents run off on him for Europe, leaving him to fend for himself. He’s now dealt with having to survive on his own with minimal resources. A job would be handy to have but he recently got fired from that. Disappointment continues to rear its ugly head for Shinichirou when he gets attacked one evening by a centipede creature. Luckily for him, he is a saved by a gorgeous high school student named Sakuya Shimazu. What’s better yet, Sakuya’s family needs a housekeeper and Shinichirou is perfect for the job. He tries to make things right by attempting to save what he thought was a human girl, but it turned out to be a nekomata, which is a two-tailed demon cat. Shinichirou needs to capture the nekomata and Sakuya enlists herself to aid him.

One of the most prevalent similarities to these two anime is the strong emphasis on occult themes. In Shinmai Maou no Testament, you have a demon lord’s daughter and a succubus living with Basara. Comparably, in Isuca we’re treated to a familiar who is able to transform into a large two-tailed demon cat or use her human form when needed. It makes things all the more interesting when we see the interactions with Sakuya, who is an exorcist and Tamako, the aforementioned familiar. The final parallel between these two shows are the main characters receiving servants through unique circumstances. We already know Mio becomes a servant to Basara thanks in large part to a master-servant pact conducted by Maria. Tamako becomes the familiar of Shinichirou spawned from a misunderstanding by Shinichirou. He assumed he was saving a human female, only to find out that wasn’t the case.

The war between demons and humans has brought havoc and despair the last fifteen years. Yuusha, the strongest warrior of the human realm is dissatisfied with their advances towards the demon realm. Yuusha decides to push towards the demon queen’s castle. Upon entering the castle he is shocked to find a remarkably beautiful red-headed queen, who is in need of some assistance. Yuusha is perplexed by the offer to ally with her and decides to initially turn it down. The demon queen rebuts and brings the war to the forefront, claiming that the humans are more united than they’ve ever been before and the kingdoms have been prospering as a result. If the war were to end, the Southern Nation’s aid would be cut short and it would leave many to starve. It’s then that Yuusha is convinced and he agrees to a pact with his former enemy.

This selection might already attract some of the ire from readers out there. The reasoning would be because Maoyuu Maou Yuusha is simply not an ecchi anime. It doesn’t rely on fanservice to sell a story. Say what you will however but there are some similarities between the two that can’t go unnoticed. The first one being that they both have a fantasy/supernatural vibe to them. The next one being that both female leads are red-headed demon lords who end up having some sort of relationship with the main characters. Finally, there is Onna, a power female swordsman from Maoyuu Maou Yuusha who draws some parallels to Yuki in that they both have feelings for the main characters and that they are superior sword fighters.

Issei Hyoudou is your prototypical pervert who doesn’t contribute much to society. His perversion garners much attention from around the school, as peeping on females is repulsive. One day an unexpected turn of events enables him to go on a date with another girl. Just when everything seems to be going great, the girl reveals herself to be a fallen angel. She then brutally murders Issei and his potential dreams of having a harem one day, or so we thought. A sultry top-class devil by the name of Rias Gremory revives Issei and allows him to become her servant. Issei initially struggles to find his new lease on life after his nightmarish first date. He joins the Occult Research Club and is introduced to many new females, much to his satisfaction. It’s then he realizes his chances of being a harem king are not too farfetched.

It should come as no surprise that this has made its way back onto the list. It really is the anime that has the most in common with Shinmai Maou no Testament. It all starts with the supernatural elements that play a large role in both anime. Whether its demons appearing in the human world or humans battling it out in the demon world, there’s a clear-cut amount of occult action to advance the stories. As much as we sell the action, it’s easy to see right through that with all the fanservice that’s showcased throughout each series. There is unrelenting nudity between both shows. Character-wise, both Mio & Rias are red-headed busty demon girls that have a long lineage of royalty in their blood. Mio is extremely loyal to Basara as is Rias to Issei.