ケツバトラー (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: This manga...is too serious! Densuke, the main character, cannot get stronger no matter how hard he trains. One day, he finds a mysterious sword at his father's grave. This mysterious sword is not to be held in the hand..., Yes, he puts it between his buttocks. ！！！！！ Thus, Densuke becomes an ass-butler. He sets off for the mysterious island of "Iwajiri Island," where all the Ketsu Butlers gather.... This is the start of a very serious...