Crossover Anime: Winning over Misako Amamiya at the start

Chen Xiao is an ordinary high school student with a beautiful adoptive mother named Misako and a beautiful aunt named Yumiko.
While working part-time at the hospital, I met a nurse named Nanase Ren.
There is a mysterious holy book in the school, and a group of strange women are performing rituals. The mastermind behind it all is actually Kitami Reika.
He wields the Spear of Longinus to dominate the world of anime and manga.
I've got all of them: Oregairu and Saekano.