What would be better between...

This is a link to the start of my novel

https://docs.google.com/document/d/1zrCgoV83wrEH3BjVM2DBEevJl90mTtNzAKgDSzGh4Q8/edit?usp=drivesdk

It's going to be a very long story with multiple sequels novels. It's a shonen story in a sci-fi world which could also be considered under mystery, drama, slice of life, comedy genres. It occurs in a post apocalypse world where an organisation protects humans by killing monsters.

There are six characters with 3 main character named Kai Akio and Juno and other three characters are kind of main characters too. They're named Sierra Keira and Jesse.

I've got two questions:

Is what I've written interesting?(Ignore the unpolished sentences and consider only the story)

What would be better between:

1. Kai Juno and Akio would be good friends from the beginning as they lived in an orphanage together
2. All three of them lived in the orphanage together but when the orphanage was shut down they were drifted away and later meet each other due to situation, and eventually their friendship strengthens