I Fell in Love with the Lapis Lazuli Vampire

Kusanagi Haruto, who is about to become a high school freshman this year, encountered the vampire Yoakemiru Ruri in a park at night during spring break and had his blood sucked by her. The next day, Ruri’s sister Mai kidnapped Haruto and forced him to choose between having his memories erased or becoming Ruri’s fiancé. Haruto chose to become her fiancé. The more he got to know Ruri, the more attracted he became to her, and thus began his days as the fiancé of a vampire.