First Lieutenant librarian. Captain of the special unit "Dojo Squad". Superior in combat and normal library office work. Has quite a short figure compared to men in his age (approx. 5'4"), but that never makes him weaker than the others.

Dojo is a strict leader and has a straight character. He always pushes his subordinates (especially Iku) to their limit. His straight character makes himself a good prey of teasing by other officers. He is usually calm and composed, but not whenever it's concerning Iku.

Despite his tendency to act mean with Iku, he deeply cares about her, even more than any of his subordinates. Multiple times, during the show, it is hinted that he has romantic feelings for her. As the story goes on, he's getting kinder towards Iku, showing great care, which results in Iku's feelings gradually changing.

Also, he likes patting Iku. He always pats her whenever she's sad, or down, or simply just for praising her.