I come to you humbled... You archive so many brushes that I'm hoping you'll be able to help me find this brush 😭🙏
Sadly, I don't - but I genuinely think I might be able to dupe it. t.
This looks like the tip 粗い線 - a.k.a., hardness. This is used on the default rough brush, and it's probably why it got deleted. So here's what I came up with:
The straight line next to it is the brush tip. It's a ribbon brush hiding as a pen! The pressure settings likely need tweaking, but you can mess with the opacity, thickness, size, and density to get a more appropriate feeling. It's hard to tell if it was Opacity or Density that was used. The low pressure settings look similar to the high pressure point, but I could be misinterpreting it. The art included has a pretty even lineweight to it, so you can adjust it to be more or less varied.
I also included a separate brush as an alternate take. This one doesn't work on the ribbon system and uses a custom set of tips I had, so it is a little more customizable. Feel free to adjust it how you like too. If it doesn't work, feel free to toss it.
You can download both (or just the first one) here. Let me know if that seems similar & how it can be changed, or if I was too far off. 👍