The story of the film is set after the conflict instigated by Toyotomi Hideyoshi ended, but not before the Battle of Sekigahara determines who shall be the Shogun of Japan. (Source: ANN)

After a blinding light emanates from her phone, soft-spoken Yuzuki is suddenly transported to an alternate world known as Shinga. The strange place resembles the Sengoku period—a turbulent time in Japanese history known for long civil wars that ravaged the country. Here, the Gekkazoku, tribes of non-human creatures like vampires and werewolves, live in harmony with humans. This harmony was maintained under the governance of Himemiko, a woman with the power to protect Shinga. However, due to her mysterious disappearance, the world has fallen into disarray. Now, Yuzuki must find Himemiko in order to go back home; but, the ongoing feud between the warlords only impedes her progress.

The deadly confrontation with the Devil King, Oda Nobunaga is over, but the struggle for supremacy continues in Warring Countries-era Japan, as the armies of Takeda Shingen and Uesugi Kenshin repeatedly engage battle at Kawanakajima. Meanwhile, on the easternmost side of the battlefield, two outstanding characters bound by destiny—one clad in azure and the other in crimson—are about to clash in a long-awaited, decisive duel. Then a sudden dispatch informs that a huge army has surrounded the forces of Takeda, Uesugi and Date at Kakanakajima. Their leader is Toyotomi Hideyoshi, the man who inherited Nobunaga's dreams and ambitions, and who is now going to bring havoc over Japan once again! (Source: Production I.G)

Fushihara-san spends most of her time stuck in front of her office computer, regularly toiling at overtime like a corporate slave, even after all her coworkers have gone home. Noticing her unhealthy situation, a ghost in the form of a little girl rumored to haunt the building takes it upon herself to scare Fushihara-san out of the office in order to relieve her stress. However, the ghost's overwhelming cuteness only does the opposite and instead motivates Fushihara-san to work even more. Even so, the presence of this adorable soul will only bring more positivity and happiness to Fushihara-san's life as the two spend more time together.