The Birth Of Katsu and Shelly's Heartwarming Friendship

"Your life happening again, without your ba being kept away from your divine corpse, with your ba being together with the akh ... You shall emerge each day and return each evening. A lamp will be lit for you in the night until the sunlight shines forth on your breast. You shall be told: "Welcome, welcome, into this your house of the living!"- The Tomb of Paheri Translation 

________________

7y/o Katsu: "Are you OK Shell-Shellwee? Don't worry, we'll go show those bullies the… pre-purr-cushions of when they bully innocent girls."

{9 Years Before Leviathan's Invasion}

Young Katsu: "Hey!

Are you the bu-butttheads who were just bullying that girl over there?"

On the playground Shelly and Katsu first met one another, it is exactly after the initial meeting of the two in which triggers Shelly's complete consciousness.