If anyone doesn't know how to get the ending where ren kill the person, i can help you. You just need to be mean to everyone . On day 4, 'encourage ren dark behavior' then choose 'i enjoy seeing it'. On day 5 , if you see the message, choose 'i feel weirded out'. Once you get inside the alley, choose 'dont do anything ' . Thats all you need to do. No problem if i manage to help you :3