She's basically declared herself Takeru Ooyama's fiancée, and she's dead serious about it—even though he barely remembers her. She's willing to stick around and wait for him to remember her properly, which is kind of sweet if a little one-sided.
Her maken is called "Kamudo," a gauntlet that amps up her strength and speed significantly. She first really showed what it could do in chapter 7, when she used it to shatter a falling boulder and then shield Takeru and a cat he'd rescued (who'd eventually become Monji) from the debris. Pretty badass moment. The downside is that pushing the maken too hard leaves her exhausted enough to pass out, so it's not exactly a power with no limits.
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