The protagonist is a beautiful college girl with a hidden obsessive “gachi-koi” (serious, delusional fan love) for Subaru, a member of a popular male streaming group called Cosmic. Desperate to become his girlfriend, she gets blackmailed by a mysterious account that knows her secrets. To “prove” her devotion, she’s forced into increasingly extreme and humiliating sexual situations, many of which are streamed live or exposed to an audience of viewers. What starts as coercion spirals into a dark mix of obsession, public degradation, NTR elements, and intense erotic scenarios where her lewd acts are broadcast for thousands to see.
Typical hentai themes include blackmail, public exposure/exhibitionism, streaming/voyeurism, mind break, ahegao, and obsessive yandere-like dynamics, with the “sticky beast” in the title referring to clingy, possessive fan behavior gone wildly out of control.
It’s an adaptation focusing on the darker, more explicit side of the manga’s stalker-fan horror elements, turned into full erotic gameplay. If you’re into psychological thrillers mixed with heavy humiliation and netorare vibes, this fits right in.