Sanae is rescued from rowning (early acces) (Pixiv Fanbox)

sanae was sent to look for a mysterious object that was underwater, although sanae has her diving equipment she can't use it as the diving tank was empty and it was going to take a while to fill it with air.

sanae dives down to look for the strange object but forgets that she doesn't have her full scuba gear and starts to drown but it seems that someone was following her behind.