On The Night I Was Crying Because My Beloved Girlfriend Was C**kolded By My Bestfriend, My Kuudere Kouhai Returned, Covered In Blood

When I was in high school, I certainly had my happy days. 「Hidaka Mai,」my beloved girlfriend whom I started dating in my first school year. 「Miyake Natsuki,」a good friend of mine who has been a rotten friend for a long time. 「Fukuhara Karen,」the only kouhai of the Literature Club to which I belong. I really enjoyed spending time with them, and my high school life was supposed to be a precious memory for me. However, it all started to fall apart when I saw Mai and Natsuki having s*x with each other. Karen who saved me from crying from the shock of seeing that scene… That night, for some reason, she returned, covered in blood. The next day. I learned that two people had been seriously i...