Despite the numerous challenges he has overcome so far, Shidou Itsuka's mission with Ratatoskr is far from over. In a departure from his daily routine, Shidou encounters a starving woman lying on the street and ends up helping her. After the two arrive at her apartment, the woman introduces herself as Nia Honjou—a popular manga artist working under a pen name. However, cutting straight to the chase, Nia reveals that she is also a Spirit and is aware of Shidou's secret operation. Interested in seeing his charisma firsthand, Nia challenges Shidou to win her over on a date. As he strives for an opportunity to seal her powers, Shidou learns more about Nia and her history with Deus Ex Machina Industries, a name he is all too familiar with...

Shidou Itsuka carries on with his quest for Ratatoskr in finding Spirits and trying to seal their powers, all while maintaining his relationships with the ones he had already sealed. Moreover, as new Spirits appear, he must undergo more complicated trials—all to put a stop to further disasters as he discovers more about the Spirits' origin.

Sequel to DAYS. The final match against Touyin Gakuin for National High School Soccer Tournament Tokyo Preliminary. (Source: MAL News)

When Origami Tobiichi asks Shidou Itsuka out on a date, Shidou considers this his best opportunity to set the record straight and end their relationship. However, even with the help of the Ratatoskr crew, his attempts to break up with her fail; in fact, Origami gladly tolerates Shidou's humiliating requests and blunt comments! Shidou's unconventional mission incidentally complicates his relationship with Tooka Yatogami, and it seems that easing the tension is only possible by going on another date.