Mysterious Girlfriend X Vol 3

From the Vertical edition

Girlfriend: The Mystery Continues Tsubaki’s old crush, Hayakawa, had been surprisingly okay with his request to taste her drool. In a fit of conscience, Tsubaki stops himself in time, but that leaves Hayakawa wanting a chance to win back Tsubaki’s attention, and so she cooks up a plot to bring both Tsubaki and Urabe to the Hoshinome Girls’ Academy’s eccentric culture festival…

Source: Penguin Random House API