Here's a brief guide to help you understand the series: Let S Go To Prison Torrent 720p Movies - 3.79.94.248
The anime consists of 13 episodes, each approximately 25 minutes long. Walkman Episode 04 -18 Ullu Web Series- -- Hiwebxseries.com Review
You can find Sakusei Byoutou: The Animation on various streaming platforms, such as Crunchyroll or HIDIVE.