Narihira Takeru is a delinquent who often thinks about Tsukimiya, the girl who appears in his dreams. After an unexpected accident, Takeru finds himself in a parallel universe, and the world that Tsukimiya lives in. When Takeru and Tsukimiya are slain by a monster, he awakens again and realizes he has leapt through time. Now, Takeru must train with Abe Seimei to fight for Tsukimiya’s life!

In the seaside city of Riverfield stands Decelis Academy, home to seven mysterious boys sharing the same secret: They're vampires, hiding their murky pasts. When Sooha, a female student who hates vampires, transfers to the academy, the boys find themselves irresistibly drawn to her. As strange events shake the city, old sins and buried secrets resurface, and their world begins to fracture.

A revolution sparked by nuclear war, natural disaster, and misrule leads to the collapse of Japanese society. The country splits into three nations vying for hegemony, and the Sangoku era begins. Aoteru Misumi, a former agricultural officer, vows to reunify Japan. He rises through the ranks with only his knowledge and eloquence. Witness the legend of the man later hailed as a genius strategist.