Sample of the Hokenshitsu no JK-san series Omake made for the release of the omnibus at C94.
Can be purchased with the Digital Bangaihen Fanza: https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_134990 DLSite: https://www.dlsite.com/maniax/work/=/product_id/RJ232986.html/?locale=en_US
Or with the Digital Collection Fanza: https://www.dmm.co.jp/en/dc/doujin/-/detail/=/cid=d_126598 DLSite: https://www.dlsite.com/maniax/work/=/product_id/RJ221266.html/?locale=en_US