Nah, in Japan, women are expected to give chocolates to most of the men they work with on Valentine's Day - just courtesy chocolates, but still something. Then the men give some small gift back on White Day. It's a lot more tradition-based than romantic, in many cases - like Ichika and her friends all exchanged friendship chocolates, and Tamaru knew Ichika's chocolates for him were the same ones she gave to the other girls - not special ones.
Now, if a woman is trying to make her feelings known or if they are a couple already, then she would give fancier chocolates or homemade. Yes, there are levels of chocolates when it comes to this stuff in Japan. If Ichika had given Ryo chocolates, she would have had to decide on which type to give him.

Why is he going out alone with this woman who clearly has feelings for him? (and accepting her chocolates too...) I even try to like him but he doesn't make it easy