My Stepmother and Stepsisters Aren't Wicked Vol. 6

LET THE GAMES BEGIN!

The class president elections have ended with Miya’s friend Koyuki chosen as their representative. But just when Miya thinks things are about to calm down and return to normal, she learns that the student council, including its ultra-strict president Mikuriya Sadame, have set their sights on her! Not only that, but it seems eldest stepsister Marika has her own bone to pick with them! Later, the girls prepare for one of the biggest events of the school year--the annual sports festival!

Otsuji is a manga creator in Japan best known for works on Pixiv, many of which have been published in book form due to their popularity (such as Toorigakari ni One Point Advice shite iku Type no Yankee and My Wicked Stepmother and Stepsisters Are Kinda Nice?!).