The text message from Haruto was definitely unexpected as he didn't usually contact him during these hours.
The group had formed a great system with Haruto as he continued to provide the group with information regarding Natasha's whereabouts and even allowed them to occasionally visit and train in the special class training room under his authorization.
Natasha; however, was very careful even around Haruto as she would never tell him where she was going or what she was doing. She was intentionally keeping him in the dark and would only come to use him for a task without giving any additional details.
Not that Natasha had any idea about Haruto's change of heart and that he was now actively conspiring with Mako and leaking information, but still she remained very cautious with her every move.
