Chivalry of a Failed Knight - Recommendations

Alt title: Rakudai Kishi no Cavalry

If you're looking for manga similar to Chivalry of a Failed Knight, you might like these titles.

Negima!? Neo

Negima!? Neo

Negi Springfield is ten years old... and a powerful wizard! This boy wizard is the greatest prodigy ever to graduate from his magic school in England. After graduation, however, Negi’s given an unusual assignment: teach English at an all-girl school in Japan. Now Negi has to find a way to deal with his thirty-one totally gorgeous–and completely overaffectionate–students... without using magic!

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Magika Swordsman and Summoner (Light Novel)

Magika Swordsman and Summoner (Light Novel)

Kazuki Hayashizaki is a sword master who, after receiving a mysterious sign from a god-demon that uses summon magic, enters the magic department of the national knight academy. Though he was supposed to be the successor to the Hayashizaki sword technique, he begins a magic class with all girls. He will use both sword and summoning in the school battle coliseum.

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Magika Swordsman and Summoner

Magika Swordsman and Summoner

Parallel to our dimension is a world filled with magic, home to a host of mystical beings and fantastical powers. Humanity has learned to harness these forces and bring forth that world's entities to do their bidding through the power of "summoners." Our world has never been the same. Fifteen years later, Kazuki Hayashizaki is chosen as the first male summoner. His attendance in an all-female summoner class, however, is met with opposition - and none so strongly than from his own sister, the school's most skilled swordsman. As Kazuki is torn between the way of the sword and the world of summoning, can he overcome adversity and learn to harness his new powers?

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I Couldn't Become a Hero, So I Reluctantly Decided to Get a Job.

I Couldn't Become a Hero, So I Reluctantly Decided to Get a Job.

Raul Chaser wants to be the Hero famed for defeating the Demon Lord - at least, that used to be his dream, until another warrior beat him to the punch! With peace now restored and all Heroes out of commission, Raul reluctantly gets a job at Leon, a small store that sells magical commodities. Compared to slaying demons, Raul’s new life of greeting customers and working the register is uneventful at best - that is, until Fino Bloodstone, the Demon Lord’s busty daughter, is suddenly hired at the stop! Raul now faces a challenge more difficult than vanquishing her father: teaching the clumsy and ill-mannered Fino how to become a respectable employee, while simultaneously fending off tentacle monsters and putting up with pervy regulars’ skirt-flipping antics!

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Saikyou no Maou ni Kitaerareta Yuusha, Isekai Kikansha-tachi no Gakuen de Musou Suru

Saikyou no Maou ni Kitaerareta Yuusha, Isekai Kikansha-tachi no Gakuen de Musou Suru

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Aesthetica of a Rogue Hero

Aesthetica of a Rogue Hero

After saving a fairy-tale kingdom, Akatsuki returns to the real world with his prize—Miu, the busty daughter of the defeated Demon King. It’s one hell of a happy ending until they’re forced to enroll at a school for magic users. There, Akatsuki can’t keep his hands off the girls, Miu’s constantly ballooning measurements make her a walking wardrobe malfunction, and it seems like someone is always plotting against them. 

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Shakugan no Shana

Shakugan no Shana

Sakai Yuuji thought he was a normal high school student, until one fateful day when time stopped. Watching in horror, he witnesses a monster devouring the "frozen" people around him; but luckily for Yuuji, he is saved by a sword-wielding red-headed girl that calls herself a "Flame Haze". The girl informs him that he has been dead for some time now and that his current self is merely a replacement for the human that he used be while alive. He is, she says, merely a torch whose life will come to an end when the blue flame in his chest ceases to burn. After this rude awakening, Yuuji realizes that he is able to see the flames of life in other "torches"; and after discovering that a friend of his is also a torch -- and her life is burning out faster than his – he gains the courage to live out the rest of his life with meaning. Will Yuuji be able to find his place in the world before he ceases to exist?

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Second-Life Cheat Mage: Life Turned Out to Be Easy after Being Reincarnated 1,000 Years into the Future

Second-Life Cheat Mage: Life Turned Out to Be Easy after Being Reincarnated 1,000 Years into the Future

Having become overwhelming strong, a mage was bored with his life and decided to reincarnate in another era about 1000 years later. But after reincarnation, the mage now known as Kurt saw a world where magic had declined, and the mages of the era are overall much weaker than those of 1000 years ago. It also seems that Kurt is being looked down upon for his "Gold Magic" as it is called "Defective Magic Power" in this era. In order to investigate the mysterious decline of magic in this era, Kurt enrolled in the Magic Academy at the Royal Capital and showed his extraordinary talent where he would become unparalleled in this second life of his too!?

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Ultimate Antihero

Ultimate Antihero

When humanity was threatened 5 years ago, the boy who saved the world was driven to despair and became regarded as the enemy of all of mankind. And now a new crisis approaches humanity. The curtain rises on a gallant drama about a hero falsely charged.

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Aesthetica of a Rogue Hero (Light Novel)

Aesthetica of a Rogue Hero (Light Novel)

After saving a fairy-tale kingdom, Akatsuki returns to the real world with his prize—Miu, the busty daughter of the defeated Demon King. It’s one hell of a happy ending until they’re forced to enroll at a school for magic users. There, Akatsuki can’t keep his hands off the girls, Miu’s constantly ballooning measurements make her a walking wardrobe malfunction, and it seems like someone is always plotting against them. 

I agree