Saki Qi: "This means I'm the acting principal of Tenjin Elementary School."
Jeanne: "Reviving the glory of the Heroic Spirits is our duty!"
Taichi Yagami: "I swear, I'll protect everything in the Digital World."
Nia: "Keeping my spot as the heroine counts as a win!"
Miyu: "Getting Illya to fall for me counts as a win!"
Hikari Yagami: "Getting my brother to fall for me... Ahem, never mind."
Simply put, it's the story of a teacher who steps up to save a school on the verge of bankruptcy (not really), then takes her increasingly ridiculous students to save the world (not really either).
This book contains elements from XB2, XB3, Digimon Adventure, Magical Girl Lyrical Nanoha, Gundam, TATAKAI, SAO, Mushoku Tensei, Shugo Chara!, Trash Witch, Oshi no Ko, Kaguya-sama, and more. It's not an overly complicated mix.
This book is also known as: I Like Nia, and Everyone Else; This Acting Principal Has a Screw Loose; Welcome to Tenjin Elementary School, and more.
The one and only designated heroine: Nia Te Heyudaja (tentative).