Judecca is a sentient Demon Lord Weapon—specifically a black imperial sword—that spent time sealed away in the Sky Library before bonding with Arata Kasuga. Since their contract, she's become one of his go-to weapons in combat and a pretty devoted companion overall.
When first released from her seal, Judecca came across as robotic and automated, almost like an AI running through basic protocols. That changed pretty quickly once she contracted with Arata. Her personality loosened up, she got more conversational, and she genuinely developed responsiveness beyond her initial programming. As a Demon Lord Weapon, she's hardwired to follow Arata's lead and fulfill his wishes—which, fans often note, extends to indulging some of his more questionable desires without much pushback.
After shifting into her human form, Judecca becomes noticeably more affectionate. She flirts with Arata pretty openly and hangs on him when she gets the chance. When it comes to other people though? She basically doesn't care. Her attention is almost entirely reserved for her master.
Content compiled by AnimeList.moe from publicly available sources.
