A Ninja and an Assassin Under One Roof Vol 4

From the Seven Seas Entertainment edition

NEW JOB, NEW ASSASSIN?! It’s time for Satoko the ninja and Konoha the assassin to turn over a new leaf with a move, matching uniforms, and a new environment! While the two of them are hard at work, a new assassin appears--there are two Marins?! Wait, are there more?! Plot twists abound in volume four of this killer comedy!

Source: Penguin Random House API