>>3416901It's a fanbook/doujin (I'm not 100% sure of the difference) but I can't find it online for free to read(which i the case with a lot of tsuritama fanbooks/doujinshis). It use to be on pixiv but the artist have deleted it since. You could try to ask them if they would bother sending you a copy (
https://www.pixiv.net/member.php?id=125057)
When doing a reverse google search I did find sites claiming to sell it
As for fanfics, I'm sure they are out there but I would have no clue where to look, not into fanfics
