杉本 剛士

The protagonist who just wanted to live his life peacefully, but unfortunately became the main bullying target after his classmates started bullying him. The leader of the bullies happens to be Mariko. 

One day while living his ordinary life, he accidentally stumbles onto an alleyway and witnesses two yakuza fighting each other, the other holding a gun while the other has a knife in his hands. The man with the gun gets stabbed and dies, and the gun in his hands falls to the side and Takeshi manages to pick it up without being noticed.

The next day, while getting bullied by his bullies behind the school, he takes out the gun and fires a warning shot, scaring two of them away. With them out of his way, he takes revenge on Mariko by raping her on the spot... and at that moment, the rape demon Takeshi was born.