There are several book series under this name, though few have reached a "Part 22" unless referring to specific chapters or diary dates: The Emily's Diary Series by D.F. Curtis : A young adult psychological romance series
The diary entry begins:
Until next time, Emily
If you have been following Emily’s journey from the early entries—through the turbulence of her lost job, the fracture of her family ties, and the haunting re-emergence of “Him” (the unnamed shadow from her past)—Part 22 is not merely another chapter. It is a crucible. In this article, we will dissect the themes, narrative breakthroughs, and fan theories surrounding this pivotal installment.
I’m taking a page from the All In for Arts initiative and making creativity a non-negotiable part of my everyday life.
Multiple books share the title "Emily's Diary," spanning different genres: : Emily's Diary: Confessions of an Emotional Vampire