コミックフラッパー
Written and illustrated by Takuma Morishige, the manga began as a one-shot published in the August 2010 issue of Media Factory's "Comic Flapper" magazine, and later started serialization in the magazine's November 2010 issue. The first "tankōbon" volume was published on April 23, 2011 and the tenth was released in March 2017. Vertical licensed the manga for North American publication under the title "My Neighbor Seki", and has been releasing volumes since January 2015. A new series titled "My Neighbor Seki-kun Junior" launched in the July 4, 2020 issue of "Monthly Comic Flapper".