Haken no Ninja Akabane

The Akabane Section, a.k.a. "Shikabane Section," is a feared department within the company. Assigned there, Yutaka Shikatori discovers its unbelievable secret! All of the office ladies in the department are beautiful lady ninjas under his command! Use your ninja skills to save the company from crisis!

(Source: MangaCross, translated)