Hitoshi Itsuki's mom is none other than the famous raemz mom! Her illustrations include "Chitose-kun is in a Ramune Bottle," "Adachi and Shimamura," "Even Replicas Fall in Love," and "I Fell in Invisible Love with You Running Through a Transparent Night," among many others!
In fact, we've even collaborated on a drawing! We'll also reveal the precious origin of her mom's name, which will be revealed for the first time! 
https://www.youtube.com/live/cxGqu54idEk?si=WGz1y82GCRrDMhiO

Itsuki's mom is... | モルトヴィヴァーチェ's post