The continuation of Yurumates 3D right after the first season.

Once a hot springs inn, now a boarding house with extraordinarily cheap rent, Yuragi-sou is virtually uninhabited save for a few peculiar residents. As rumor has it, it is haunted by a vile ghost which scares away all potential tenants. Therefore, it is the perfect refuge for Fuyuzora Kogarashi—a broke, homeless psychic seeking an affordable roof to stay under and ghosts to exorcise. Kogarashi prepares for a face-off against the ghost, only to find out it is not as malicious as the rumors made it out to be. Instead, it is the ghost of a beautiful, silver-haired girl whose only recollection of her life before death is her name: Yuuna. Even more baffling is that the other tenants of Yuragi-sou not only are able to see Yuuna as well, but each has their own supernatural ability. Amidst the chaos caused by his quirky fellow residents, Kogarashi attempts to uncover the regret that keeps Yuuna anchored to the world of the living, lest she become an evil spirit sentenced to spend her afterlife in hell.

In a world where humanoid armored weapons known as Titatonostrider (TS for short) are used in warfare, troops from various countries converge on the island of Oahu, Hawaii, including Ao Isami of the Japan Ground Self-Defense Force and Lewis Smith of the United States Marine Corps. Isami and Smith cross paths during battle, but suddenly, their teams are attacked by an unknown enemy, scattering soldiers and sending their forces into disarray. In order to save their friends and survive on the deadly battlefield, they must fight with every ounce of courage and pride that they can muster. (Source: Crunchyroll News, edited)

The story takes place in the era of the gods, year 300. Yuuna Yuuki lives an ordinary life as a second year middle school student, but she's also a member of the Hero Club, where club activities involve dealing with a mysterious being called Vertex. (Source: ANN) Aired along side Yuuki Yuuna wa Yuusha de Aru: Washio Sumi no Shou Movie 2 - Tamashii.