Imagine moving to a new town when you just hit puberty. That's a bummer since it's a military area, so fun levels are zero with curfew and armed checkpoints. Now you have to go to a new school. Which sucks, since your classmates are LITERALLY monsters. And kids with weird abilities developed in secret government labs. It'd still be OK, but your love interest is a boy. Which freaks your parents out, since you're also a boy. And it's the 90s in Russia. He also tries to kill you. YAY!
Cat Demon's Seduction S1
The cat demon reincarnates with the memory of the previous life and becomes a dual personality to avenge its lover!