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There is this thing called “tachiyomi" in Japan. Basically, because bookstores don’t generally have anywhere to sit and read, people stand in the aisles and read manga, especially the magazines like Shonen Jump.
Not only do they get in the way (seriously, if you want to buy stuff, it can sometimes be hard to wade through the people standing there and reading), but also obviously this equals lost sales for the publishing companies and they don’t like it.So occasionally, they print ads or posters in the manga magazines asking people not to read. Here is one that Konomi-sensei did while I worked with him.
Niou and Yagyuu do not want you to tachiyomi! So don’t tachiyomi, I guess. ;)