Horror

One day, Mai remembers that her perfect stepbrother is a character in a death game manga, and that one year later he will hold a death game involving all of his classmates, killing his sister in the process.
Mai plans a variety of surprises for her stepbrother every day based on what he said in the manga, "Nothing unexpected happened, so I was bored," but as the days go by, he begins to show abnormal signs...

Earnest and well put together, Sada is a teacher that's popular among both his colleagues and students alike. One day after school, while he was on patrol, he saw a suspicious figure attacking a female student with a knife. Unable to escape in time, Sada ended up losing his life. However, Sada woke up on a cold slab... (Previously serialized with the title 'Living Dead