There really isn't a sequel or season 2 yet. But there was an ONA that was first released. That's what actually got me hooked up on this manga. When the ONA was released, it was just one video, it was funnier and had more details, but it was somewhat just the first episode of the anime, and the first few chapters of the manga. Was kinda sad that time that it didn't have a continuation for the animation, and the manga was not yet caught up in translation. But anyway, maybe that's why you thought there were 2 seasons already
I actually solved it LMAO, so it was another sports anime and the mc also had amnesia, but the sport is water polo and he prob gained back his memory and won competitions which was not on this story it's my memorys' faultt
I rewatched the anime and why did i remember that wasn't all of it, i mean i remember there was a movie sequel or a season 2 but apparently there's none and the season 2 is still on 2027