It is a brush made by tinkering with the mapping pen (initial tool).
The habit is quite strong, and I don't think it's very easy to use.
丸ペン（初期ツール）をいじって作ったブラシです。
癖はかなり強めで、使い勝手はあまり良くないと思います。
Example usage.
使用例です。
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