Ore no Imouto ga Konnani Kawaii Wake ga Nai

Synopsis

Having read Kuroneko's fanfiction online, Kirino decides to write some of her own. The two of them get into a fight concerning their literature tastes. After Kirino posts her novel online, she receives a tentative publishing offer. In order to get inspiration for her next novel, Kirino drags Kyosuke around the city on Christmas Eve. She manages to get Kyosuke to buy her some earrings, claiming that they were for emotional support. When Kyosuke claims that Kirino is doing this simply for her own self-gratification, she pours a bucket of cold water over her head to prove otherwise. They stop by a hotel so Kirino can shower and change her clothes. Out on the streets again, Kyosuke feels closer to Kirino as he notices her warm smile while wearing the earrings that he bought her.

(Source: Wikipedia)