Ruikasa smut fanfic, Rui perspective, Rui and tsukasa are 18, Not any ships fully included, possibly a slight emunene but mostly platonic, maybe possible akitoya, but that is it.

In a world where vampires exist in the shadows, hiding among humans, Chuuya, a young and rebellious boy, has been living a normal life until an encounter with an ancient vampire changes his fate His best friend, Dazai, who always seemed to carry his own dark secrets, is the only one who notices the slow and horrifying transformation taking place in Chuuya. As the two navigate a world of death and survival, their bond grows deeper, but a dark twist lies ahead.