The girls spend their time at a school built in a deep forest. Their secret is that they are all vampires. In order to hunt without being noticed by humans, the girls are bonded by blood, and what does the "sisterhood" bring to them?
Shoujo-tachi no Kizuato ni Kuchizuke wo is a completed manga by Haruhana Aya, first published in 2021. It blends girls' love and fantasy. You can read all 18 available chapters of Shoujo-tachi no Kizuato ni Kuchizuke wo online for free on MangaPulse; the newest is Chapter 17.5, added 2024-01-13. The series is finished, so you can read it from start to end in one go.