二丁目路地裏探偵奇譚 (にちょうめ ろじうら たんていきたん, Ni-Choume Roji-Ura Tantei Kitan)
4koma comedy manga by Kobayashi Tetsuya, published in Manga Time Kirara from January 2007 to July 2010. Revolves around the daily lives of several unusual characters working at a detective agency.
Tetsuya has also drawn his original character Fila in some promotional material, but she's not actually from the manga.