There's a rare anime from 1991 called Dororonpa (どろろんぱっ) created by Mayumi Muroyama . It was based on a manga and ran for 115 episodes. It originally aired on TV Asahi but reran on AbemaTV . I used to think the show itself was lost but there are episodes that can be found with torrents. They seem to have been ripped from a digital source, but of which I have no idea. and from what I can gather, the series has never been aired outside Japan.
One thing that does seem to be lost though is the full version of the opening sequence "CREAM SODA/MELON SODA". It was completely missing from digital rips and I can only find a part of it on YouTube which I'll link below.