I've been having fun reading this manga, but this was the first volume that has felt like a romance. They do have some great chemistry. They balance each other out Nana brings out his playful "soft" side, and Tendo pushes Nana to be the best version of herself.
I was shocked when it was mentioned that they'd been working together/dating for a year. I wasn't expecting that, the story moves so fast it seemed that it had only been a few months. I wondered why this manga had a Mature rating, and this volume is why. I wonder if the rest of the series is going to get steamy the way this one did.