Undefeated Bahamut Chronicle - Recommendations

Alt title: Saijaku Muhai no Bahamut

If you're looking for manga similar to Undefeated Bahamut Chronicle, you might like these titles.

Yagate Maken no Alicebell

Yagate Maken no Alicebell

Seiji Harada usually avoids girls due to the fact that he believes that they are the source of all problems. As he enters his high school years, he is forced to join an all-girl school that recently began admitting male students. Now surrounded by all girls, he begins to realize that all members of this high school possess special powers, including himself. 

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Yagate Maken no Alicebell (Light Novel)

Yagate Maken no Alicebell (Light Novel)

Seiji Harada usually avoids girls due to the fact that he believes that they are the source of all problems. As he enters his high school years, he is forced to join an all-girl school that recently began admitting male students. Now surrounded by all girls, he begins to realize that all members of this high school possess special powers, including himself. 

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Infinite Stratos: Official Anthology Comic

Infinite Stratos: Official Anthology Comic

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Infinite Stratos (Homura YUUKI)

Infinite Stratos (Homura YUUKI)

The development of the Infinite Stratos powered exoskeleton changed the world’s balance of power. While the distribution of IS systems has created peace, only women have been able to pilot them. So when Ichika Orimura is discovered to be the first male with the ability to control an IS, whatever plans he had for his future are tossed out the window even as he’s thrown to the wolves and enrolled at the otherwise entirely female Infinite Stratos Academy by order of the Japanese government!

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Hundred

Hundred

Hundred - that is the only weapon that can oppose the mysterious life form Savaga visiting the earth. The protagonist, Kirasagi Hayato, aims to become a Martial Arts Master using this Hundred. He managed to get into the battleship university Little Garden. "I wanted to see you, Hayato!" "How do you know my name?" Around the roommate, Emil Crossford, who somehow knows him well, Hayato gets an uneasy feeling. What’s more, just after the entrance ceremony, he gets asked for a duel by the campus’ strongest martial arts master Queen Claire Harvey.

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Infinite Stratos 2: Official Anthology Comic

Infinite Stratos 2: Official Anthology Comic

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Tenchi Muyo! War on Geminar (Light Novel)

Tenchi Muyo! War on Geminar (Light Novel)

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Junk Force

Junk Force

The year is 2100! On a barren Earth, natural environmental reproduction is no longer possible. The population has placed its stakes on a reckless organization in hopes that it can purify the planet for environmental growth. But the organization known as Z.P.T. fails tragically. Many humans are transformed to white sand. Was this massacre an accident, or does Z.P.T. hold some dark intent for the unfortunate inhabitants? In this post-apocalyptic future three buxom young women - Liza, Wooty, Mill - and one fortunate young man, Louis, use their mechanical prowess to fend off waves Z.P.T.'s superior mechanized military forces.

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Infinite Stratos

Infinite Stratos

The development of the Infinite Stratos powered exoskeleton changed the world’s balance of power. While the distribution of IS systems has created peace, only women have been able to pilot them. So when Ichika Orimura is discovered to be the first male with the ability to control an IS, whatever plans he had for his future are tossed out the window even as he’s thrown to the wolves and enrolled at the otherwise entirely female Infinite Stratos Academy by order of the Japanese government!

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Fukanzen Shinsei Kikan Iris

Fukanzen Shinsei Kikan Iris

Three quarters of the world is the world of the dead. The world has been invaded by phantoms. One day, a boy named Nagi finds in the mountains of scrap wood a mechanical teenage maid girl. He immediately takes her home to repair her. The first things that Elise, this mysterious mechanical maid, says is, "Good morning, Nagi." Who is this mysterious silver haired girl? The fate of the world rests in their hands.

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