Toshi Densetsu no Hanako-san

Taniguchi Hibi, a perfectly ordinary person working at Yano Houki Cleaning Company, goes with her senior colleague, Kijima, to clean a public toilet in a park. Hibi is forced to clean the women's toilet and tries to erase graffiti on the stall door. There, she finds the mysterious words, "Third stall toilet from the entrance → Knock three times..."... A hunt for an outlier urban legend begins, involving one urban legend = Hanako-san of the toilet and one encounterr = the protagonist!! (Source: Taiyo Tosho, translated) Note: The new edition has eleven chapters.