I think this is their 2nd Hifuu book after https://www.pixiv.net/en/artworks/48854612
with sample like that might not worth uploading

Base +13

Well, too late, cause someone else HAS uploaded the sample now (https://e-hentai.org/g/1853170/c5a2e9fdaf/)

Also, while this may be (the sample one) Rapa's first hifuu doujin, techincally speaking, Yume no Sono Saki de Aimashou (https://e-hentai.org/g/927489/0c16e297a1/) is Rapa's first hifuu doujin, since it's starts Maribel and Koishi's first meeting (with Renko appearing near the end), as well that that doujin was published the 29th of december of 2014. 1 year before this and the sample's mark of released as well like 5 months before Urban Legend in Limbo was released as well.

Base +5