Osomatsu-San Character Pocket Sketchbook (Karamatsu) Which Matsuno brother is your favorite? The theme of these sketchbooks is bath time and features each of the brothers from Osomatsu-san. You can draw whatever you like inside the notebook with its blank, unlined pages. Use it well To celebrate Akatsuka Fujio's 80th anniversary, Osomatsu-san, an animated series, shows the growth of Osomatsu-kun into an adult. The story of Osomatsu-san is about the Matsuno sextuplet brothers, Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Juushimatsu, and Todomatsu, growing up together. These fun animated characters with a little crazy characteristics have made it a very popular show