MY LITTLE SISTER CAN'T BE THIS CUTE Manga (Ore no Imouto ga Konna ni Kawaii WakegaNai!)

Ore no Imōto ga Konna ni Kawaii Wake ga Nai (俺の妹がこんなに可愛いわけがない)
also known as Ore no Imouto or Oreimo for short, is a Japanese light novel series written by Tsukasa Fushimi, with illustrations by Hiro Kanzaki.