Proposal : Update Anime Itai no Itai no Tondeike source

Proposal details

This proposal will make the following change(s):

Update the source of the anime Itai no Itai no Tondeike

Change the source from Unknown to Original

Based on the following reason: Missing

With the source: https://myanimelist.net/anime/59080/Itai_no_Itai_no_Tondeike?q=itai%20no%20itai&cat=anime