Dark theme for Oshino Ougi from Monogatari Series
** Update **
-- RECOMMEND --
There is a newer version, feel free to try it.
https://chrome.google.com/webstore/detail/anime-girl-theme-oshino-o/echnejkgiafagajkfedihfojdbccegjf
Oshino Ougi (from Monogatari Series) dark theme. Pic from Twitter.
忍野扇/〈物語〉シリーズ/物语系列