The younger brother Fubuki, who was searching for his missing sister-in-law Miku Haoka, meets Miku again at Tomomi's house, who is her sister's classmate.According to Tomomi's story, Miku is the dark side of the dark Shinsai. He says he became obsessed with it. In order to save Miku, Fubuki decides to become a coach for the dark Shinsai. Fubuki approaches Koyuki Fujimiya, who Tomomi has chosen as her target to strengthen her dark new body techniques. I didn't know what my fate would be after that... rnrn