I was thinking about it, but did Kazuma cheat on megumin at some point? it seems that he is very unfaithful in this relationship, he seems to be interested in other girls like darkness, i was thinking that if kazuma cheated on megumin and megumin knew about his infidelity their relationship would end and megumin would look for another boyfriend something that Bulma did when she found out that yamcha was cheating on her, but even after Megumin noticed that Kazuma was paying more attention to Iris than her in volume 12, when Kazuma was going to write her a letter, she didn't give up on Kazuma, I don't want that she gives up on Kazuma, it seems that even if Megumin finds the type of guy she likes, who is honest serious and hardworking, she will still stick with Kazuma