Formerly at https://twitter.com/hamjamart/
I cannot find a trace of this person anywhere anymore. Their twitter account is gone.

However, I do have a backup dump I did of the entire twitter account on August 7 of 2021. Any pictures after that date I very likely do not have. So if you do, please consider PMing me on the forum or at least commenting here.
Or, if they've moved, and anyone knows where, please let me know. I'd love to make this collection more complete.
There are four images at the end that I don't think are duplicates that I found on rule34.xxx and are attributed to HamJam. That's all I've noticed.

I tried to de-dupe this gallery; there could still be a couple in there, though.

You are looking at preview of your future
Roughly 2 years ago someone named mari spam in a doujinshi I read and I hate him since. I start noticing his name more in other galleries shitting and other user notice him as well

here's him complaining about gallery doesnt contain something he want but actually contain it https://e-hentai.org/g/1320583/fdacebf282/ (as usual he return the 2nd time to justify his complaint)
here's him complaining about gallery contain something he doesn't want but actually doesn't contain it https://e-hentai.org/g/1180055/26662dc821/
same stuff https://e-hentai.org/g/1319354/89845ad33c/
We doubt he even read and just second guessing based on cover
https://e-hentai.org/g/1333142/4903bf46bc/ "complain about the situation when he clearly never saw the source material"
Well thats confirm it. So now if find people complain about his comment, I won't read it
yaoi https://e-hentai.org/g/1435582/ba59f5bc42/ going to a genre he doesnt like and insult people who like it
2 years before he likes yaoi https://e-hentai.org/g/983125/9075883c2a/ so I don't know if he got raped or what that he start to insult everyone
back to yaoi, heres him not knowing how to troll and just make braindead first impression
https://e-hentai.org/g/1835829/77d1916e38/?hc=1#comments (even @LeisureLarry agree)
arguing with people Hinahara doujinshis for no reason
https://e-hentai.org/g/1350868/1611c7489b/ he was baiting /trolling and since no one bite, he doesnt continue.
to quote aleden in https://e-hentai.org/g/1245353/84dd8133f6/ point out it is not just me, he is everywhere spamming "I just can't ignore shit I dislike, I must constantly bitch about it"
most of these comments happen on new gallery in 1 year span (sounds familiar? ). Any gallery but shota,showing how biased he is with this critic guy comment bait

Why I tell all of this? Because in the last 1 page of cgc upload,you spam more comment than I did to warn people about the spam comment in 2 years
In my case he bait on random gallery that just been uploaded, but in your case, that Rakugaki Ippentou was unfortunate since it was the last batch he upload in 2021. The difference being you decide to spam on whole page of his upload. Complains from galleries I listed are all justified because other people read those gallery. You don’t even read Rakugaki Ippentou

Base +12, Moonlight Rambler -24, Mr.tema -4, Zblayde -6