Code Name X. X that looks really rather familiar. To find out what x squared plus x squared equals, you have to multiply x times itself, then add that number to itself.
There is a little more information about the female character in code name:
Perfect world games, maker of the perfect world mmo, is developing a new mobile game based on an unnamed jrpg ip called “code name: X is based on the persona 5 franchise. Perfect world entertainment is creating code name: Her name is rukawa yuki, and she's older than the protagonist by .
