Kaguya-sama: Love Is War, Volume 1 of 28 (by Aka Akasaka)

Two high school geniuses scheme to get the other to confess their love first. Two geniuses. Two brains. Two hearts. One battle. Who will confess their love first…?! As leaders of their prestigious academy’s student council, Kaguya and Miyuki are the elite of the elite! But it’s lonely at the top… Luckily for them, they’ve fallen in love! There’s just one problem—they both have too much pride to admit it. And so begins the daily scheming to get the object of their affection to confess their romantic feelings first… Love is a war you win by losing.