I wanted to review Haikyuu!! - Season 4, which I consider the best tv series ever. No finer tv series has ever been made in Animation category... and it is now for free on. That's really great if a tv series can keep me focused for the whole duration, that's what Haikyuu!! - Season 4 is doing. However, this genre may boast of one of the larger number of popular titles. I did not expect anything from Haikyuu!! - Season 4, but it surprised me. The whole tv series is still very relaxing and motivating.