Kaguya-Sama: Love is War Vol 4

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.?!

Will Kaguya and Shirogane outsmart a psychological test designed to reveal their true feelings? Is spoon-feeding each other cake the way to each other's hearts? Then, Shirogane visits Kaguya's home for the first time, but she is too sick to enjoy it. Kaguya tries to befriend Shirogane's little sister, but Chika has beaten her to the punch. And summer vacation arrives, but the student council still hasn't agreed on a destination.

Fireworks are supposed to be romantic.