Close Friends[]
Zen Wistaria[]
Obi is one of Prince Zen’s aides and refers to him as “Master”. Their relationship begins quite terse given the nature of their first meeting, however, Obi proves his worth and is accepted as Zen’s official messenger and Shirayuki’s guard. Obi has had a record of playfully teasing Zen, especially about his relationships or even complimenting Zen's eyes. As time goes by, Obi grew more attached to Zen and later even admitted that he 'likes' Zen when he was confronted by Zen. Obi appeared to like Zen enough for him to stay around longer as he admitted that he once had the intention to leave one day but changed his thought afterwards. Obi is also Zen’s wingman, teaching and reminding him how he should be treating and complimenting Shirayuki, often by example, much to Zen’s chagrin. Zen is aware that Obi has feelings for Shirayuki, though trusts him to know his place and continue to serve his duties and protect Shirayuki. They grew close enough for Obi to be able to tease Zen, purposefully making the prince jealous but Zen never truly got angry at him and Obi never truly had the intention to take Shirayuki away. Zen trusts Obi deeply and Obi is extremely loyal to him.
Shirayuki[]
Obi, calling her "Miss" or "Little Miss" ("My Lady" in official translations). Obi has been revealed to have feelings for Shirayuki since saving her from collapsing at Fort Laxdo due to exhaustion, and these feelings grow more intense as the story unfolds. Shirayuki is currently unaware of these feelings. He is very observant and copes quickly with her fatigue and frustration. He sees her as a strong and capable person, however, her way of dealing with problems can get him into trouble and thus understands why he is the most appropriate guardian for Shirayuki given his agility. Later in the story, Shirayuki and Obi get closer. When Shirayuki was transferred to Lyrias for two years, Obi was commanded by Zen to be by her side as a knight and a messenger, to protect her. The day before he obeyed the command, he confessed to Zen of the fact that he likes Shirayuki. Before embarking on a journey to spread a flower, Shirayuki mentioned that he looks nice under the firelight, before admitting that she can be herself with him. Shirayuki trusted Obi deeply and has a close bond of friendship towards him.
Mitsuhide Rouen[]
Obi maintains a friendly relationship with Mitsuhide as a fellow aide referring to him as "Mister". Obi often makes jibes at Mitsuhide for being uptight and sentimental, though respects and values him as a friend, who goes out of their way to ensure the comfort of others.
Kiki Seiran[]
Obi and Kiki have a somewhat distant relationship with each other, though readily rely on one another when the situation calls for it. When the situation does not call for necessity, Kiki would prefer to leave Shirayuki to monitor both Obi and Zen, during Mitsuhide's and her absence in Chapter 89. Early on in the story, Obi would make romantic innuendos to Kiki, but it never went further than that. Obi occasionally playfully flirts with Kiki but he was never truly serious with it. However, he was genuinely surprised after learning the news of Kiki's engagement.
Friends[]
Ryuu[]
Obi acts as something akin to a big brother for Ryuu and often calls him "Little Ryuu". Ryuu often comes to and confides in Obi for advice on his own shortcomings to become both a better person and pharmacist that other people can rely on. As Ryuu gets older, Obi begins to tease Ryuu about falling in love with Shirayuki. However, Ryuu's naiveity on the topic of love and related feelings do not give Obi the teasing material he so desires.
Torou[]
A fellow assassin Obi often worked with in his past on high risk jobs. Given their line of work, it is customary and habitual to act as if they are not acquainted in public. Obi respects her in their line of work, though dislikes that she leaves the mission's most challenging aspects to him so that she can breeze through. At the conclusion of Chapter 33, Torou decides that the current Obi is completely different to the Obi she knew in the past, insinuating that he had become soft and weighed down by people he now holds dear.
Suzu[]
Suzu is one of the pharmacists he befriended after arriving in Lyrias. The two became friends almost naturally, given that Suzu's nonchalant attitude mixes well with Obi's playful attitude. Suzu often makes harmless jokes regarding topics concerning women and relationships which Obi enjoys. The two were revealed later on spending a lot of time eating meal together and drinking after they finished their work.