Juuou Mujin no Fafnir

What the 2 have in common: The same situation where guy sees girl naked and nearly got owned, and guy find himself attending in an all girls school, except in one anime the girls competed for the guy while in the other anime the girl's despises the guy {for the meantime}. However one was more of supernatural and magic, while the other one was more of sci fi with magic.  

-both have a similar story -both have the MC all alone in a school full of girls -both have MCs are called the world's strongest but they are weak -both have the MC becoming a harem king -one is set in the modern world and the other is set in the fantasy world 

Both involves one guy who is drafted to be in an all girls school of magic, where it has harem , romance and supernatural, except one was more of a school setting while the other is responsible for protecting the world. 

Both have a guy who has a power only girls should have and goes to s special school just for people with this power. They both then happen to stumble across a naked girl within 5 minutes of the show starting and both times before they've reached the school. These girls both also go to the school and he then becomes a pum magnet and attracts half his female classmates 

Both shows start the same, MC finds a nake girl bathing thought to be an intruder and got attacked. Both male MC's have powers that only girls have and attend into an all-girls academy of magic. Both shows involve harem, magic and academy life. 

I can say that both anime are really simillar. The moment when two MC met. MC is the only boy who can use magic. He has something special about him. MC is surounded by girls who like him. I can say that these animes are like twins. Even MC are simillar. 

- main character with dark past - similar/same fighting concept (summoning weapons with the own soul) - magic high school/academy anime with a harem - white/silver-haired main girl 

Absolute Duo is like Juuou Mujin no Fafnir because: Both Main Characters are different from all others in their universe: Tooru has a shield rather than a weapon and Yuu is the only male D, plus he can use the least amount of dark matter. Both series are in part set in a school. Both main characters have a group of girls who are enthralled with them. Both main character's love interests are also different from everyone else: Julie is an El Awaken, and Iris blows stuff up whenever she creates dark matter. Both main characters have superhuman fighting abilities BEYOND the superhuman fighting abilities of the people who go to school with them: Tooru has the superhuman punches (Mjolnir and Hrungnir) read more 

The almost same story where a boy enrolls in a girls academy who has exceptional magic powers and every girl falls for him. Both shows show the Mc fight up the tsudere first and then move on to enroll. 

What the two have in common: Both have the same plot where it involves inter dimensional Kaiju's who came in to destroy the world and it is up to a group of high school students to fight them, both were also shown at the same season and have the same amount of genre, However, in JMnF the MC involves a lone guy in an all girls school who happens to have the same abilities that the girls have, while the MC in STnWB is set in a coed school and guy have a rather unique ability that other students don't. Also the point of conflict in JMnF involves the MC trying to get the girls to be on his side, while proecting them from his own side, while in STnWB, the point of conflict involves the MC trying to protect his harem from their own sides. Also, in JMnF the girls uniform are cute while the school uniform in STnWB is a boring white. read more 

They were both shown in the same season, except one was more entertaining than the other, while Seiken Tsukai no World Break does deal with giant monsters, it was mostly focus on the girls fanservice, while Juuno Mujin Fafnir was more on the cute side. 

Although the Juuou Mujin has only aired 1 episode so far there are still a few similarities between the two. One being that one of the MC is the only male to attend school gifted with power of dragons or being "D" whereas in Is male MC is only male pilot of IS. Other similarities is of obvious harem element and some female character personalities. My hunch is if you liked watching Infinitive Stratos you might enjoy this title.  

The series is somewhat similar with IS: Infinite Stratos, where the main male protagonist is the only one in the world who can use power which normally only female can use. There is also the fact that the male protagonist is enrolled in a school full of females despite being a male. I just have seen 1 episode so I can't say that much about it. But I have to say, it also begins with his sister being a high person in the series. I liked the first episode, but I wasn't to impressed. I hope you know a little bit more about it and why you should watch it if you are a IS fan.  read more 

The setting takes place in an academy setting that teaches them how to use their powers. In Fafnir, they fight dragons. In Kuusen, they fight giant beetles. Both use CGI designs. The main character has the same voice actor.