My Name Is Kyosuke Kosaka, but I Don't Want to Be a Siscon

I had no idea what to write, so I decided to put Kyosuke through the wringer again. Several of my works, each over a million characters long, have already been taken down, so read with confidence. My head is usually empty, so why does it suddenly fill up when I see my little sister? A filter! It must be the family filter! Hehe, little sisters really are adorable!