Stealth x Mates

is a japanese 4-koma manga series written by Toto Nemigi. It began serialisation in the March 2012 issue of Manga Time Kirara.

The series was released under 1 volume in April 2014.

Synopsis
Before I knew it, a cousin girl had become a ninja. That's the kick, and the transfer student, Kouji, gets caught up in the battle between the two Ninja Research Departments ...? The days of Kouji, who are swayed by girls (ninjas), are fun but full of unexpected happenings!