Later on in the story, Darkness starts to develop feelings for Kazuma after he saves her from her arranged marriage. 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.ĭarkness also sees Kazuma as a good friend who she can trust and rely on. Though he considers her "a helpless crusader," he does sincerely care for her, and vice versa. Nonetheless, she seems to enjoy his verbal abuse, much to Kazuma's dismay. Darkness often blurts out perverted thoughts, which Kazuma often snarks at either verbally or mentally.
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. Despite this, he often looks at her with lecherous eyes. While she fulfills his fetish for an "onee-san with great figure," her personality turns him off. Kazuma refuses Darkness' initial approach to join the party, but eventually concedes. 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. Funifura delivers a letter to Megumin, while stating she couldn’t believe that she and Kazuma are an item. They noticed that they were followed by Yunyun, Funifura and Dodonko. In volume 17’s special short story, Megumin asks Kazuma on a date in which they took a casual walk around the town. This left Kazuma uneasy, but Megumin promised him that they will continue afterwards. 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. In volume 14, Megumin offered to give Kazuma a handjob but they were interrupted. Since then their relationship progressed a bit faster to the point were they have attempted sexual acts. 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. In volume 9, Megumin confessed her feelings to Kazuma, to which he confessed as well. She is also the most defensive in their party when Kazuma is bad mouthed by strangers. 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 described him as someone who is idle when wealthy, yet hardworking when in need of funds and perverted, yet reliable during emergency situations. She considers Kazuma a contradiction at times.
Aqua is also notably the only girl in his party that Kazuma doesn't think or do anything perverse towards. 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. 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). While under normal circumstances he would never admit it, he does value Aqua as a companion. In many regards they act akin to a pair of siblings. They would often argue and point at each other's respective flaws, which results in Kazuma usually making Aqua cry.
He thinks she is useless yet cute when she is silent and calm. That being said, the two are inseparable and Aqua even relies on Kazuma more than she admits.
Their relationship seems platonic thus far, as neither of them sees the other as an object of affection. 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. Aqua is the first person Kazuma meets after dying.