Yo! This is just an info dump in case you didn't read the manga. I'm not gonna put any spoilers (but if you didn't read it, this will be spoilers anyway...)
~~~~
Yozakura: A family of elite Spies with superhuman abilities.
the eighth gen, ninth gen, and tenth gen are living happily.
Tanpopo: A mysterious organization prioritizing a project called the 'Seed-Sowing Project'.
I'm pretty sure that Tanpopo didn't have any other projects but for the sake of the novel there will be a 'side-project side' of Tanpopo. Basically the main project rules over the side-projects.
Project Termite: A project created with the intention of creating a 'monster' strong enough to go toe to toe with the Yozakuras.
Hinagiku: (Not yet formed) (From my understanding Rin created the Hinagiku once she became an adult) (I'll see what I can do with this.)
Spy Association: A place where spies internationally try to join because of the amount of benefits involved. Includes: more clients, easy access to info, etc...
(Kai is not yet the leader.)
Teiou Academy: An academy where Spies learn. Very famous.
A/N: Does anyone know how to 'edit' a chapter instead of replacing the entire thing? I've seen concerns like this a lot.