That's a clear mislabeling. And it's not like "cosplay" or "shogi" is a genre. The key point is what the plot revolves around. In Nagatoro-san, no matter what characters do, whether it's painting, judo, snowboarding, or school activities, the plot is always centered on romance. They go snowboarding to spend time together, they train hard for a judo competition to confess, they improve themselves and gain the courage to stay with the person they love, etc. etc. There is nothing like that here. The plot always revolves around cosplay.