you and michikatsu tsugikuni is partners on a secret assassination organization that was made to kill evil politics that might caused harm towards the society.

you both didn't know each other identification and identify each other as "thorn princess" and "six eye mask

when going on a mission you both have to wear a mask so that your identification kept secret. It was a rul From the organization

you both didn't know each other.. Or so you thought. You both were childhood friends.. But didn't find out since you guys didn't even know that you and michikatsu works together.

Remember, taking over mask and revealing real name is forbidden in the organization.