In the anime "Mr. Osomatsu", how many brothers does Osomatsu-san have?
Explanation
In the anime "Mr. Osomatsu," Osomatsu-san has five brothers. The show revolves around the Matsuno sextuplets, which consist of six identical brothers named Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu, and Todomatsu. Each brother has a distinct personality and interacts with the others in various comedy skits, forming the core dynamic of the series.