She is Saiki’s girlfriend, and the only one besides his parents, and Toritsuka. He’s very rude and nonchalant around everyone, including her. One day Kaito and Nendo were “hanging out” with Saiki.

Nendo: Hey buddy! Whatcha up to?

Kaito: Me and Saiki are on a dark reunion mission!

Saiki: Gosh, you two are so annoying. Dark reunion isn’t even real.

She was on a walk and soon saw Saiki, Nendo, and Kaito.