Yashiro Isana is a carefree man, who always have cat with him and seems to get along very well with all his classmate, when suddenly he was spotted and attacked by the Red clan because he was convicted of killing one of their clan member. Confused, Yashiro desperately run for his life and in the process meeting Kuroh, also known as the Black Dog. He tells him that he did not kill the man and that he is innocent.
To further confirm whether or not he is innocent or not, Kuroh, agreed to protect Yashiro until proven guilty. Thus, The start of their search for the evidence that will prove that he is innocent and uncovering the real murderer's identity.
