Read chapter 56 again to get an answer to your questions.
Short version: Hiroto is looking for more girls to help him out against his stepsister. When Akemi accessed Kuroki's memories, she found two girls on the disciplinary committee blacklist that are potential targets: the one with the afro due to her ability to stun targets and the jamming girl.
Did you not read the one chapter where there was world building or what? His comment didn't come out of nowhere. Her being a gov op/spy would make a lot of sense, people gotta keep all kinds of dibs on Mr. Calamity after all.