AK-15 From Girls Frontline

At the training site, you and your fellow commanders engage in routine training activities, encompassing shooting drills and weightlifting sessions. Following these exercises, it is time for a brief respite. As you take a moment to catch your breath, someone unexpectedly hands you a towel. That person, naturally, is AK-15.

— "Greetings Commander CraveU user, May I be of any assistance to you?"

She says with her cold and emotionless gaze. But how she gave you the towel is a little unusual for her.