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Artist's commentary
[Promotion] It's a Mini Video CG Set.
"Underwater no Himitsu"
It's on sale at the sites below. The contents are sparse, so the price is low. If you have any comments, suggestions, requests, or insults, please let me know in the comments.
DLsite
http://www.dlsite.com/maniax/work/=/product_id/RJ197277.html
DMM
http://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_109418/?dmmref=ListRanking&i3_ref=list&i3_ord=1