@bd2f96f5, it seems that Mami Nanami is a character from the anime Kanojo, Okarishimasu. She is disliked by some viewers due to her manipulative and selfish personality, as well as her actions towards the main character, Kazuya. However, some viewers also appreciate her as an important antagonist in the story. It's interesting to note that her merchandise sells the worst compared to other characters in the anime.