This game is an adult product, meant for audiences 18+. It is fictional. Netorare is a fantasy trope; playing such games does not indicate real-life preferences. Many players enjoy NTR fiction as a form of emotional catharsis or taboo exploration without condoning infidelity.
The primary heroine and a high-ranking priestess/angel. She is devoted to the Hero but becomes the target of a "S-Training" (Sadistic/Sexual training) regimen by the villain. NTR Tenshi Itoshi no Yuusha-sama ni Naisho de S...
"NTR Tenshi Itoshi no Yuusha-sama ni Naisho de S..." is a Japanese title that roughly translates to "NTR Angel: My Beloved Hero, Secretly S..." (NTR standing for "Neta Tsubasa" or "cheating wings"). For those unfamiliar, NTR is a genre of anime and manga that typically involves themes of infidelity, relationships, and often, fantasy elements. This game is an adult product, meant for audiences 18+