Four different stories:
1. Business men Tannai and Okano work together. Okano knows he's gay but Tannai denies his own sexuality. After a drunk night, the two sleep together. Okano is insecure but the two eventually get together.
2. Spirit Animal with human Junnosuke form a bond from the mountains. The spirit animal eventually finds a child for inheritance purposes
Chapter 4: Previous high school classmates meet as adults at a hotel where one is a rich mogul, Shunsuke Saeki, and the other is a hotel worker, Mitsuru. Saeki purposefully picks on Mitsuru harboring a long-time unrequited love for him. Mitsuru gets caught by Saeki and the two sleep together. Saeki apologizes for his forcefulness but Mitsuru admits his feelings for Saeki. The two end up together.
Chapter 5: Misturu, grandson a man named Tooru, meets a vampire named Viore at his grandfather's funeral. Viore tells Mitsuru that the ring he wears on a necklace was his to his grandfather and requests that Mitsuru be his partner. Mitsuru becomes curious of Viore history with his grandfather and investigates. He discovers that his grandfather and Viore use to be friends but it was an unrequited love. Mitsuru wants Viore to love him for him rather than his grandfather's look-alike. Viore leaves but 10 years later the two reunite and Mitsuru becomes a vampire. OK story.
Toubou Kinshi!