Aqours performs at their very first major live concert and... something unexpected happens when Riko takes to the piano. Dramatization of a real-life event.

Pompeii, 79 AD. Honoka's a boy in love with Umi, a girl from a noble family. Kotori, princess of the current King, was unfortunately in love with Umi. One day, the volcanic eruption of Mt. Vesuvius destroyed the whole town. Now, reincarnated in the present, Umi starts to have reoccurring dreams about her past life as she struggles with the memories of her past and present love.

Nico Yazawa, had always found Maki Nishikino, the redheaded freshmen a bit irritating. So, she always turn everything to a "competition" Rather if its just having an argument, being mean towards each other, or even teasing. But when Nico finds something shocking about Maki, It changes her perspective of the redhead beauty. Will they ever realize their true feelings for each other?

Maki fell sick and it's up to Niko to nurse her back to health. Meanwhile, Niko starts to feel more for Maki while the red head remains utterly and adorably clueless to Niko's apparent feelings.