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Choujin Gakuen is a manga written and illustrated by Yousuke Kokuzawa, serialized in Bessatsu Shounen Magazine since 2009. It is about a supernatural human named Adam Shinjou, who befriends a demon girl named Oska L. Duke in a mansion and teams up with her to start an academy for monsters.
Fighting Over the Homeless Girl and Mr. Higan's Struggle Against His Divorce (Volume 3, Chapter 9)
Yoshino is under control by the chairman, and gains weight as the result of an eating contest, remaining this way until one point in the next chapter.