Yofukashi no Uta

Kou Yamori experiences sleepless nights and an urge to roam, wandering the streets in search of an undefined longing. Each night is spent in aimless thought until he encounters Nazuna, who may be a vampire. She presents him with the possibility of dark powers and eternal life, but only if certain requirements are fulfilled. Kou must determine how much he is willing to sacrifice to achieve his goals and embrace the allure of the night.