A popular V-tuber named Ai Kyouka, known in the real world as Mai Torimori, learns about her disease. It proved to be fatal, and her odds of making it were low. After announcing her retirement on social media, the criticism that followed made her feel depressed and even contemplate suicide. While in college, she converses with Akihito Nagai, who secretly admires Ai Kyouka.

Witnessing her being depressed at school, he attempts to assist her in getting back up. Mai's relationship with him deepens through their continued conversations, but she knows she will eventually have to leave. With just 30 days left, Akihito attempts to bring happiness to her life despite being unaware of her condition.