Hayate, Nagi and the gang spend the last days of summer break at Nishizawa's countryside vacation home. But a mysterious spirit has concocted a scheme to separate the butler from his young mistress. (Source: ANN)

Adaptation of the short story written by Manta Aisora for the first issue of GA Bunko magazine.

The day before the ceremony marking the completion of the Yajima Stadium, Nils Nielsen invites Sei Iori, Meijin Kawaguchi, and others to an exhibition battle using the new large-scale battle system he has designed. Now that they are all reunited, Sei attempts to show off the Build Strike Cosmos that he has upgraded for the exhibition, but then he notices something missing... Meanwhile, somebody takes control of the stadium's systems, sealing Sei and the others inside. Before them appears a mysterious group, which has come to challenge them to Gunpla Battle.

Gintarou is a fox spirit that has been protecting the small Inari temple since the Edo era. Saeki Makoto's family possesses the power to see the gods' agent, but the ability is limited to one living relative at a time. When Makoto's mother passed away while she was still young, Makoto inherited the ability as the sole remaining family member. With the help of fox spirit's power, Makoto and Gintarou help the people of their community, in spite of their many differences. (Source: MangaHelpers, edited)