Chocotto Sister (ちょこッとSister, Chocotto Sister?) is an ongoing manga series written by Go Zappa and illustrated by Sakura Takeuchi. It is published by Hakusensha in the magazine Young Animal and collected in 8 tankōbon volumes to date. The series has been adapted as an 24-episode anime by Nomad, airing in 2006 and released on 8 DVDs. It is also known as Chokotto Sister and Chocosis.

Bincho-tan (びんちょうタン, Binchōtan?) (also Binchō-tan) is a mascot character, created by mangaka Takahito Ekusa (江草天仁, Ekusa Takahito?) and produced by game goods company Alchemist.

The name is a play on words: binchōtan (備長炭, binchōtan?) is a kind of charcoal, which is mainly used for cooking. However, -tan is a suffix created by the mispronunciation of chan. Relating to this dajare, the main cast is the moe anthropomorphic representations of different types of charcoal.

An anime began airing in February 2006 that was produced by Studio Deen. [1] Animax, who have also broadcasted all episodes within respective networks across Southeast Asia, South Asia, East Asia, translating and dubbing the series into English and other languages. The anime is set in Minabe, Wakayama, a location that is the largest producer of binchōtan charcoal in Japan.