Takamachi Kana Will Never Let Nanoha-chan Get Hurt

Only the first chapter is written in first person.

The Interdimensional Space-Time Security Administration of the Pan-Human Civilization Sphere, usually called the Space-Time Administration, is an organization established by the Mid civilization to ensure the safety of all civilizations within the pan-human sphere.

Since Nanoha Takamachi is one of the pan-humans, Kana Takamachi naturally decides to join the Space-Time Administration's Interdimensional Navigation Corps to ensure Nanoha's safety.