Characters (often the "oyako" mentioned) are used as vessels or offerings to appease the summoned deity.
The summoning of an evil god or deity.
This specific genre often contains "dark" themes (non-consensual tropes, ritualistic horror); always check the tags/trigger warnings on the product page before purchasing. Characters (often the "oyako" mentioned) are used as
One of the largest platforms for doujinshi and independent adult games. Characters (often the "oyako" mentioned) are used as
Refers to a parent and child (often a mother and daughter/son) appearing together. Characters (often the "oyako" mentioned) are used as
Often takes place in underground shrines or gothic cathedrals.
If you are looking for works that match these specific descriptors, it is best to use official Japanese digital storefronts that support the creators. Many of these sites offer "Extra Quality" versions of popular adult titles.