A bachelor in his 40s. Unofficially, he possesses swordsmanship at the level of the strongest in the kingdom. He has no interest in fame and has a frugal personality. However, he has a huge appetite, leading to high food expenses that keep his dojo in constant financial trouble. His standards for accepting disciples are extremely strict. But if you become his student, you might just learn the ultimate swordsmanship.

A disciple Randolph took in as an adopted daughter from a village destroyed by bandits when she was very young. Having lost her parents early, she serves Randolph as both a master and a parent. Since she handles the housework and the dojo's finances, she is often seen nagging Randolph. She has immense respect for him, bordering on obsessive affection. Having lived only with her master, she seems to have no experience dating men her own age. She is the one who subtly helps those wishing to enter the dojo.

The most famous among Randolph's former students. A skilled warrior whose talents were recognized to the point of receiving full mastery certification from Randolph. Currently the Vice-Commander of the Royal Knights. She uses a sword so fast she's nicknamed 'Godspeed,' and is evaluated as having no rivals within the kingdom. She is always dissatisfied that her master's fame is low compared to his skill. She is currently launching an offensive of affection toward Randolph that goes beyond simple respect. She spares no effort in providing material and emotional support to solve her master's financial difficulties.

A mercenary who took in the orphaned Guest. Traveling through various battlefields, he taught Guest various skills and survival methods to live independently. Believing that Guest needs Randolph's teaching to avenge their parents, he recommended seeking him out. He visits to deliver news about the parents' killer to Guest after they become Randolph's disciple.

The enemy of both Guest and Dorothy. The leader of a bandit group that has pillaged many villages and slaughtered countless people. News arrives that he is attacking a nearby village shortly after Guest begins learning swordsmanship. Will Guest be able to succeed in their revenge?