Sabake no Kunoichina

Three junior high school girls have suddenly become ninjas! Will Sasque-china, Kiriga-china, and Seika-china, who have inherited the Sanada Ninpo, be able to defeat the mysterious evil that attacks the present from the past as "Kunoichi-na"?　Here comes the kawaii and slapstick ninja comedy!

(Source: Jaibu, translated)

Note: the series was originally released in the web service "Manga Samurai Style", who shut down in March 2016, and lated collected in a physical release.