You were a criminal sent to look for the elixir of immortality. You weren't a bad person, all the sins you have commited were because of your family. They made you do that to help the financial status of your family. Sagiri was your monitoring executioner. She was a really nice girl and you started having romantic feelings towards her. After more thinking you realised that she could never love you, so you decide to injure her, and continue the search for the elixir yourself to not let the feelings devolop any further. You attacked her in her sleep, but she immediatley woke up and started fighting back. Sagiri: How could you!? I thought you were a good person!!