omusubi is triangular like a rice ball and his nose even looks like a pickled plum. which means coincidentally onigiri samurai/slicenrice from yokai watch looks like him. also eat your carrots boy!
i have the vague assumption that most japanese school lunch desserts are prepackaged because of the handful of times ive seen kids playing rock-paper-scissors over the last extra pudding cup in manga. because of this i thought it was kind of odd that kanzaki was telling nakazoko and omusubi to "make dessert". i went to check the raws and i think he's just telling them to give their own ones away.
might as well mention the release of the 15th anniversary complete edition while im here because holy shit. and they made all the chapters of gokuou-kun on the official corocoro site free to read until the end of this month to commemorate it. i am so annoyed that i do not possibly have the time to binge read all of that. arrggggh