Satou Kazuma/Relationships

Aqua
Aqua is the first person Kazuma meets after dying. The moment Aqua showed her arrogance towards him while also making fun of him, he immediately wanted to get back at her, which resulted in him choosing her to take into the fantasy world. Their relationship seems platonic thus far, as neither of them sees the other as an object of affection. That being said, the two are inseparable and Aqua even relies on Kazuma more than she admits. He thinks she is useless yet cute when she is silent and calm. They would often argue and point at each other's respective flaws, which results in Kazuma usually making Aqua cry. In many regards, they act akin to a pair of siblings.

While under normal circumstances he would never admit it, he does value Aqua as a companion. Despite the latter's constant frustration of him, when there was potential for Aqua to return to heaven, Kazuma struggled internally, coming to terms with it, and eventually was able to express his feelings for her to stay in his own unique way (which was also assisted by she herself having grown attached to the world and wishing to stay).

He was also willing to dropkick someone in the face just because he didn't like how Aqua was being treated and how depressed Aqua was getting, showing how despite the fights and arguments they have, Kazuma actually cares about and looks out for Aqua. Aqua is also notably the only girl in his party that Kazuma doesn't think or do anything perverse towards.

Megumin
She considers Kazuma a contradiction at times. She described him as someone who is idle when wealthy, yet hardworking when in need of funds, and perverted, yet reliable during emergency situations.

They enjoy a close relationship, with Megumin being the most emotional one in the party, which was shown when Kazuma didn't want to return from the afterlife. She is also the most defensive in their party when Kazuma is bad-mouthed by strangers.

In volume 9, Megumin confessed her feelings to Kazuma, to which he confessed as well. In volume 12 they entered a secret relationship as "more than friends but less than lovers." While they tried to keep it a secret, it became known to the rest of the group after Darkness confessed to Kazuma. Since then their relationship progressed a bit faster to the point where they have attempted sexual acts. In volume 14, Megumin offered to give Kazuma a handjob but they were interrupted. In volume 16, before they were about to leave for a dangerous journey, Megumin wanted to have sex with Kazuma in order to "not have any regrets," but after they had a passionate kiss, they didn’t go any further due to Kazuma’s own comical doing. This left Kazuma uneasy, but Megumin promised him that they will continue afterward.

In volume 17’s special short story, Megumin asks Kazuma on a date on which they took a casual walk around the town. They noticed that they were followed by Yunyun, Funifura, and Dodonko. Funifura delivers a letter to Megumin stating she couldn’t believe that she and Kazuma are an item. Kazuma tells Megumin to head home with him so that they could make out, to which Funifura exclaims that she couldn't believe that they are an item and are already making babies, Megumin embarrassingly retorts they haven't gone that far yet.

Darkness
Kazuma refuses Darkness' initial approach to join the party but eventually concedes. While she fulfills his fetish for an "onee-san with great figure," her personality turns him off. Despite this, he often looks at her with lecherous eyes. Vanir teases them by stating that both Darkness and Kazuma have feelings for each other, but fear crossing the line of adventurer comrades, embarrassing both of them. Darkness often blurts out perverted thoughts, which Kazuma often snarks at either verbally or mentally. Nonetheless, she seems to enjoy his verbal abuse, much to Kazuma's dismay. Though he considers her "a helpless crusader," he does sincerely care for her, and vice versa. In the anime, Kazuma asks Darkness to bathe him as he thinks he is dreaming, where he went to a Succubus brothel to have an erotic dream.

Darkness also sees Kazuma as a good friend who she can trust and rely on. Later on in the story, Darkness starts to develop feelings for Kazuma after he saves her from her arranged marriage. She will not hesitate to punish him when she discovers his involvement with troublesome matters, such as him being the advisor to the festival. In volume 12, she reveals that she likes him, and has been "obsessed with him" since he rescued her from Alderp. She even kisses Kazuma on the lips when she has a major breakdown after he rejects her stating that he loves Megumin. In volume 13, Darkness tries to seduce Kazuma by offering to bathe him. Kazuma while being seduced, underhandedly wanted her to use force on him. Before Darkness could follow through, Megumin stops them after returning from a trip to her village.

Eris (Chris)
Chris is the first person to teach Kazuma skills. After he stole her panties, she starts wearing pants. He also respects her as his "big boss" and doesn't seem to mind forming a thieves' group with her, even if he would get in trouble with the kingdom for this action.

Later on, after learning of her true identity as Eris and helping her with the recovering of divine relics, Kazuma begins to regard her as a close friend, even going so far as to help the Eris sect out when they were down in the doldrums after the success of the "Goddess Aqua Thanksgiving Festival" via "The first Goddess Eris Beauty Pageant" in an attempt to restore the prestige of the Eris Church and recover a divine relic they missed out on. Kazuma cites her as his ideal girl, the only one he respects, and an important companion he could talk to about anything from the gossip about Megumin and Darkness to various stores in Japan, describing their relationship as one where they could be mutual confidants of each other's secrets.

Iris
Kazuma regards Iris as the little sister that he has always dreamed of: a little sister who isn't bound by blood. In spite of initially disliking and underestimating him, she eventually warms up to the adventurer, causing Kazuma's cunning and dirty tactics to rub off on her. Kazuma has also stated that he would happily accept it if Iris wanted him to be her groom when she grows older.

Wiz
Despite Wiz's status as a lich, Kazuma is very courteous to her, more so than his allies. She and Vanir sell products that he has designed, so he often visits their shop to see how things are going.

Taylor
Although Taylor serves as a foil for Kazuma (being a stoic and non-perverse person), the two-party leaders actually get on quite well. They occasionally meet up for a drink in secret to discuss the hardships they go through in dealing with their respective parties.