@Firestorm252
It's a reference of "No Guns No Life" and Z2's lines where she always addresses her doll as "Z1". And in this comic, her doll has a body (that looks like No Guns No Life) and claimed that he's the real "Z1".
@Mctheprotector
Thank you kindly. Not familiar with that series, so that was completely over my head and wouldn't know where to start looking this time hahaha