I'll find the matsuri clip and post it here, but he's an infamous loli doujin author.
Edit:
I may just take the L on this mission. The Matsuri clip I'm looking for was the first time I heard his name, and it's because she straight up name drops him and reference one of his more infamous works. I can find tons of people referencing her doing this, but the clip is no where to be seen as far as I can tell. It was a big early clip with hundreds of thousands of views. I would keep searching but I don't really want to keep searching his name over and over
As a consolation here's Matsuri implying yagoo is into JK's