Rakurai (lightning blade)

This is the story of a boy who seeks the answers to his past. The key to unlocking the special cage he calls "self-discovery". After switching schools midway through his final year of highschool, Yato Shirou had been tasked with surviving in the best school in Tokyo. However, shackles from his past and an unavoidable fate from the future close in on him. Will he come out of this blood filled tunnel in one piece?