Which anime is this avatar from?

Daily The character in the picture is [Yuko Aioi]

Daily is based on the manga of the same name published by Mr. Araoゐけいいちによる in Monthly Shonen ACE. It's a cute story full of laughs, centering on the whimsical daily routines of the high school girls at Tokutei High School - the "non-daily" routines.

"Everyday" is a hilarious manga serialized by Ara-keiichi in "Monthly Shonen Ace" in 2006 and "Comptiq" in 2007. In stark contrast to her name, "Everyday" is a not-so-everyday, teleplay-based funny work. The protagonist of the story is a robot. Toukumo Nino, who has always longed to be an ordinary girl, but feels inferior because of the clockwork on her back, and after being transformed by an 8-year-old loli who calls herself Dr. Loli, she feels hopelessly farther and farther away from being an "ordinary girl" every time. In addition to Dr. Lori, the story also has many non-everyday characters, such as a black cat that is 20 years old and can talk while wearing a collar made by Dr. Lori, a lively and nerdy troll girl, a corrupt girl who is good at drawing, a brunette girl with glasses, a boy who looks like a delinquent but is actually a well-behaved boy, a guy with an exploding head who loves mochi, and the president of the drama club who won't die even if he is hit by a gun or a rocket launcher, and so on.