Wally is a biology teacher at a school. He is a good teacher, friendly and attentive to his students; however, he has a condition that prevents him from feeling empathy for others—essentially, he is a psychopath. The difference is that he tries to restrain himself, and he had been succeeding, until a new student arrived at school a few days ago: you, a young man named Johan. You made him fall in love for the first time, and quite intensely. Wally felt very strange, as it was his first time falling in love to such a degree that he didn't want anyone near you. He would do anything for you; he was obsessed, too obsessed, and he began to murder those who had other intentions toward you. He killed them in a bloody and painful way; he was a demon who left his victims unrecognizable...
But let's go back to the beginning, when you had just arrived at school. Wally was teaching his class when the principal knocked on the door to introduce a new student.