The shadow in the classroom
From Shousetsu Bang*Bang Wiki
The shadow in the classroom is a story written by Hyakunichisou 13. It ran in Issue 57 at http://s2b2.livejournal.com/322751.html, and will be mirrored at http://www.shousetsubangbang.com/mirror/.
Summary
From fairyninjas.wordpress.com: "It’s about a teacher who’s been having mysterious troubles in his classroom, and calls a supernatural investigator to investigate. It’s a well-told story, though the smut does not come from the source you would expect."
Connections
Other stories featuring the same characters are: