DLsite
https://www.dlsite.com/pro/work/=/product_id/VJ011748.html/?unique_op=af&utm_medium=affiliate&utm_source=erogamescape.dyndns.org%2F

DMM
https://dlsoft.dmm.co.jp/detail/cveaa_0048/?utm_medium=dmm_affiliate&utm_source=egsa-001&utm_campaign=affiliate_toolbar&utm_content=text

Gytto
https://gyutto.com/i/item201311/af-256?select_uaflag=1

確かに「2」だけの単品 DL 販売は無いようだがその意味だったのかな？