Ore no Imouto ga Konnani Kawaii Wake ga Nai

Synopsis

Noticing Kirino has no one to share her hobbies with, Kyosuke asks for advice from his friend, Manami Tamura, who suggests that she make some otaku friends. Kirino joins an online community and is invited to an otaku tea party at a maid café in Akihabara, but has trouble talking to any of the other members. However, she is later asked to join members Saori Vageena and Kuroneko, the latter of which gets into a heated debate with her about their favorite anime. After a day of shopping around Akihabara, they decide to keep sharing messages while Kyosuke finishes the game Kirino asked him to complete.

(Source: Wikipedia)