The Takashiro siblings really drew the short end of the Vampirism stick. They can’t fly or turn into bats and they don’t even have superhuman strength. The only bright side is that they don’t have to worry about burning to a crisp in the light of day, but the other negatives are overwhelming enough.

Throughout the short series, Kazuna is endlessly driven to stalk others, putting him at risk of losing his relationship with his high school crush Yaegashi who worries about him. As she attempts to get closer to him despite his violent outbursts, he withdraws harshly from her. It’s a very painful scenario which plays out, keeping your loved ones away to protect them from yourself.

While Kazuna has very few memories of his sister, he has many of his mother before she died. His sister bears a striking resemblance to her and Chizuna claims that he reminds her of their father. Over the series, the two grow closer to each other, as Chizuna desperately sacrifices herself to save her brother from going as far as she has. They are alone in the world since no one else bears their affliction and feelings of love begin to grow between them. It’s bittersweet, immoral, and above all else, not meant to last.

Hitsuji no Uta was based on a manga by the same name, and for what it’s worth, the manga adaptation went on for a bit longer than this short OVA series. Some material was skipped, but the biggest difference is the ending. What choice do you have when you are forced to live in society as someone who poses such a great risk to humanity? For Kazuna and Chizuna, the choice was made for them from their birth. While the resolution isn’t exactly ideal, it is final. It’s up for debate which outcome would have been preferable.