Don’t you know? She’s from the current hit slice-of-life anime entitled Sanka-Sanko. It revolves around a group of schoolgirls in a class;
A-chan: A mature looking girl who always boast about herself being only interested on psychological and plotty anime. Hides a childish side in her. Quite tsundere.
B-chan: Loves magical girls and extremely perverted. Her hobbies consist of fondling her classmates’ breast and flipping their skirt up. Enjoys watching ero anime.
Arte-chan: The onee-sama of the class; often being sarcastic and talks with a straight face. She’s the president of the school’s newspaper club. Dislikes Aya Hirano.
Nosta-chan: An annoying frail looking girl who always talk about how the old days were golden. A hipster who hates everything that’s new. Dreamt of having sex with Hayao Miyazaki.
New-chan: A loli who doesn’t care about her surrounding and only pay attention on the current mainstream stuff. Hates History classes.
And last but not least:
Top-chan: Enjoys making random rankings that causes storm around the class.” —From sankaku’s comment thread