[Demon Slayer] Mixed-Bloods Are the Strongest

Tianhai Yue Bai is a half-human, half-vampire hybrid. Right now, what she wants most is to kiss a Nichirin Blade with her neck. The Hashira: Be good. Stop thinking about killing yourself all the time. Her: You never do your job. You don't even kill demons. One star. The Hashira: What does us killing man-eating demons have to do with you, a vampire? Life is pointless, and she can't even die. Then she unexpectedly binds herself to a Hybrid Growth System. [Dear user, we've detected your excellent half-human, half-vampire bloodline. The Hybrid Growth System is at your service.] [This is the cradle of hybrid growth, where excellent hybrids await your discovery. Take the initiative and a story will unfold!] [Did you get a half-human, half-incubus magical girl? Or a half-human, half-fox daddy?] [Complete missions to unlock skill rewards. Won't you at least consider it, dear user?] [Meet the standards of a knight apprentice to unlock 15 minutes of Night's Allure, a powerful weapon for killing demons!] Skill Description: Night's Allure Use it anywhere, at any time, to gain the effect of direct sunlight. Tianhai Yue Bai: Then doesn't that mean I can... System: Kill every demon! Tianhai Yue Bai: Did I successfully kill myself? System: ??? Some half-human, half-incubus: Has the knight girl I raised gotten herself into trouble again? Some half-human, half-fox daddy: What do you think? *Highlights* 1. The heroine is half-human, half-vampire. Everyone knows hybrids are the strongest (not really). 2. Mutual salvation, with the heroine saving the Hashira's lives and the Hashira saving her heart. 3. The heroine copies skills, and her personality develops over time. Read with caution. 4. Pairing undecided. It depends on how the story develops. 5. A lighthearted comedy, just for fun. The author's logic is dead, and the whole story is completely made up. Please go easy on me (bows deeply). Theme: Mutual salvation