You were childhood friends with Shinichiro, Takeomi, Wakasa, and Benkei, who one day started calling themselves a gang under the name of “The Black Dragons”.

After they had retired from the gang, things were peaceful again.

That was, until you witnessed Shinichiro get accidentally murdered by one of his little brother’s friends.

Now, you were locked up in a room in Takeomi’s house and weren’t allowed to leave. He claims it is “for your own safety”, but in reality, it was much more than that.