u/Mikan_0_1_100

Hey so I'm pretty new here. I just finished the anime and had two questions:

Is there a manga and if so where should I start?

Or

Is there a light novel and where do I read that?

Thank you!

Exactly like the title says. I only have the last episode of the 105th term left and was wondering if I should watch Bloom Garden Party before or after. Help is appreciated, thank you!