The Hero and the Demon King

The Hero and the Demon Priest

The Shota Hero and the Loli Demon King

The Hero and the Big Four

The Hero and the Truth Serum

The Hero and the Golem

The Hero, the Demon King and the Hot Spring Trip

The Hero and the Demon King's Little Sister

The Hero and that Family

Extra Chapter - Hero, the Princess of Darkness & the New Year

Volume 1 Extras

Side Story (Mage #1) - Hero and the Mage

Side Story (Mage #2) - Hero and his Comrade

Hero and Returning To One's Family Home

The Princess of Darkness and an Old Tale

10.6 Hero And The Father In Law

Hero and Father-in-Law

Hero And The Terrifying Battle

Hero and Hell

Hero And The Great Cooking Tournament

Hero, The Princess Of Darkness And The Magician

Hero, The Princess Of Darkness And The Magician 2

Hero And The Female Warrior

Hero And The Love Triangle

Poison And That Girl's RomCom

The Hero, The Princess Of Darkness And The Magician 3

The Hero And The Princess's Sake

The Hero The Princess Of Darkness And An Important Friend

Hero And The Princess Of Darkness's Influence

Magician And The Inseperable Relationship

The Hero And The Princess Of Darkness's Influence 2

The Hero And Forbidden Love

Hero And The Maidens In Love

Hero And Souryo

The Hero And The Princess's World

Poison And That Girl's RomCom 2

Hero, Maho And Scien Suu 1

Hero, Maho And Scien Suu 2

Hero And Crazy Psycho Suu 1

Hero And Crazy Psycho Suu 2

Hero And The Princess's Privacy

Hero And Let's Raise a Child!

Hero And The Black Demon

Hero And What's Your Name?

An Episode Of Elizabeth

Hero And A New World

Savage! Princess Of Darknesses True Character!

Hero And Totally Completely Stark Naked

Hero And An Extreme Person 1

Hero And And Extreme Person 2

Hero And And Extreme Person 3

Hero And The Man Who Will Become A Woman In 2555 Days

Hero And From Boy To Girl 1

Hero And From Boy To Girl 2

Hero And The Bermuda Triangle

Hero And, Differing Fates

Hero And Let's! Death Match!

Hero And Don't Leave Me Alone

Hero And Someone I Want To Be With Forever

Hero And Princess Of Darkness Dyed Red

Hero And Two People In Love With One

Hero And "The Weather Is Nice"

Hero And Scien Suu Land

Hero And Jump Huuuug!!!

Hero And A Dreadful Shadow

Hero And Meet The Parents

Hero And It Begins

Hero And Hateful Bitch

Hero And 4 Giving It Their All

Hero And Important People

Hero And First Hit

Hero And Joyful Friends

Hero And First...

Hero And I Just Wanted

Yuusha And Mao

The one holding the title demon king is actually a super cute big breasted girl who has only one thing to say to the funny hero: "Damn... I'll kill ya!" No, wait that's not- Err, I mean the Romcom involving a lot of blushing, humiliation and flirting begins here!! 
 
(Source: Japanese Publisher, translated)
 
Note: Includes 14 extra chapters.