Both dramas combine sport and business themes into one, and based on novels of the same writer. The plots are different though, where Roosevelt Game has "parallel sport-business story" but No Side Game is a more directly connected sport-business kind of story.

Surprisingly no one is recommending this yet. Both dramas are written by the same screenwriter. While Confidence Man JP is about conman and Legal High is about law, main leads in both dramas share similarities. Dako (Nagasawa) is the female version of Komikado (Sakai), and Boku-chan (Higashide) is the male version of Mayuzumi (Gakky).

Both drama have parallel sport and business plots combined together, in the sense that business maker got inspired by the sportsmen fighting spirit to save their company from collapsing. Both are based on Ikeido Jun's novel and produced by TBS, so the viewer will get the similar feel and vibe. There are also technical stuffs being discussed in both dramas in particular how investment in RnD and having the right expertise can distinguish a company from it's much bigger rival.

Both dramas written by the same person. While they have different stories, the overall emotional feeling is a bit similar in my opinion. In both, the male leads live in lower life due to family circumstances. And on every episode, new plot twist will be revealed. The difference is that in BNNH the plot twists are more shocking/surprising, while TNH's are more subtle.