I watched this anime for the first time back in 2014. Probably one of the first animes I've ever watched. Maybe I'm biased but this is such a great series. I wish a season 2 would be made but honestly its so underrated and unknown its near impossible to have a season 2. The story is so good, the music also does a great job of setting the atmosphere. Without this anime, I wouldn't be who I am today. This anime will forever have a special place in my heart and will forever be my comfort anime. I've rewatched this more than 20 times and I never got sick of it. Instead I find myself having fun noticing tiny details I didn't notice before. Please give this a watch. 10/10 would recommend.
Also, if you want more from this series I recommend reading the manga and the light novels. The novels are so good and new translations are coming out for it too at the time of writing this!