I feel like Crunchyroll used to have it, but I searched for it and couldn’t find it. Myanimelist suggested HiDive might have it, but so far as I can tell it doesn’t. Does nobody have it any more?
Also, how is Crunchyroll deciding what can be watched with free account and what requires premium? I got an urge to watch some Laid Back Camp, which came out many years ago at this point, and they’re requiring premium for that? I went over a year not watching any anime, so I’m kind of out of the loop on the streaming scene.
It should be on HIDIVE as it’s a Sentai license, but recently their content has been disappearing only to reappear weeks-months later. ANN reported on some of them and someone even made a list of the ones that were missing a year ago but I don’s see Kids on the Slope listed there so I think it’s a recent disappearance.
As for Crunchyroll premium, they’re phasing out free streaming if I recall correctly.
livechart shows it is available on Aniplus Asia, bilibili & VVVVID
I don’t know the answer to your question. I just wanted to say good taste! Kids on the Slope is one of my favorites.